How to Set Boundaries With Your Ex: A Practical Guide

Setting boundaries with your ex is one of the kindest things you can do for yourself after a separation, and it is the thing women tell us they wish they had done sooner. When a relationship ends, the old rules about how you speak to each other, when you are available and what you owe each other end with it. New rules do not appear on their own. You have to set them.

This guide walks you through what healthy boundaries look like, how to put them in place without a row, and what to do when your ex tests them. It sits alongside our full co-parenting after divorce guide, which covers the bigger picture of raising children across two homes.

Why does setting boundaries with your ex matter?

Without boundaries, the emotional patterns of the old relationship keep running. A message about a school shoe turns into a dig about the past. A late reply becomes a guilt trip. You end the day drained by someone you are no longer with.

Clear boundaries change the relationship from a personal one to a practical one. They reduce the number of decisions you have to make in the moment, because the rules are already agreed. They also model something valuable for your children: that you can treat someone with respect while still protecting yourself. Boundaries with an ex are not walls to keep them out of your children’s lives. They are guardrails that keep everyone on the road.

What do healthy boundaries actually look like?

Boundaries fall into a few practical groups. You will not need all of them, so pick the ones that match where the friction actually is.

• Communication boundaries. One agreed channel, for example text or a co-parenting app, used for children and logistics only. No calls after a set time unless it is an emergency. No expectation of instant replies.
• Emotional boundaries. You do not discuss the old relationship, your new life or theirs. “I’m not going to talk about that” is a complete sentence.
• Practical boundaries. Handover times, who pays for what, how changes to plans are requested and how much notice is needed.
• Home and physical boundaries. Your home is yours. Your ex does not let themselves in, turn up unannounced or linger at handovers if that makes things tense.
• Digital boundaries. Unfollow or mute where you need to. You are not obliged to share your location, your plans or your social media with someone you have separated from.

Notice that every one of these is about your own behaviour, not theirs. That is the part people miss. A boundary is not “you must stop calling me late at night”. It is “I don’t answer calls after 8pm, so anything after that will be picked up in the morning”. You can enforce the second version entirely on your own, which is what makes setting boundaries with your ex possible even when they refuse to cooperate.

How do I start setting boundaries with my ex?

Start small and start specific. Here is a sequence for setting boundaries with your ex that works in most situations.

1. Decide your limits privately first. Write down the three situations that drain you most. Those are your first boundaries. Do not try to fix everything at once.
2. State the boundary once, calmly and briefly. “From now on, can we keep messages to the kids and arrangements? Anything else I won’t be replying to.” Short, factual, no essay of justification.
3. Pick your channel and stick to it. If everything goes through text or an app, there is a record, and heated phone calls stop being the default.
4. Use neutral, business-like language. Think of it as a working relationship with one shared project: your children. Our guide to co-parenting communication scripts has ready-made wording for the trickiest messages.
5. Follow through every time. A boundary you enforce sometimes is a suggestion. If you said you will not reply to messages about the past, do not reply, even when the message is unfair and your reply would be brilliant.
6. Expect a wobble, not a miracle. Most exes test a new boundary a few times before accepting it. That testing phase is normal and it passes faster when your response never changes.

Setting boundaries with your ex when you share children

When children are involved, setting boundaries with your ex works best when the practical arrangements are written down. A parenting plan is an informal document that records what you have agreed: the weekly schedule, holidays, handovers, how decisions are made and how you will communicate. Once it exists, most day-to-day questions already have an answer, which removes the need for constant negotiation. GOV.UK has a helpful overview of making child arrangements when you separate.

Keep the children out of the middle. Messages travel between adults, not via a ten-year-old at handover. And however tempting it is, avoid criticising your ex in front of the children. They are half of each of you, and they feel it. Our guide on helping children adjust to two homes looks at this from their side.

If you cannot agree the arrangements between you, family mediation gives you a structured way to do it with an independent professional, and it is usually less stressful, quicker and less expensive than going through court. For child arrangements cases there is also government help with the cost: the family mediation voucher scheme offers up to £500 per family towards mediation, it is not means-tested, and your mediator applies for it on your behalf (as of July 2026, see the Family Mediation Council).

What if my ex keeps pushing against the boundaries?

The hardest part of setting boundaries with your ex is rarely the setting, it is the keeping. Some exes accept new boundaries quickly. Others push, sulk, or escalate before settling down. When that happens, resist the urge to explain yourself again in longer and longer messages. Restate the boundary once, in the same calm words, then act on it. Silence in response to provocation is not rudeness, it is the boundary working.

Keep a simple record of anything significant: missed handovers, abusive messages, repeated breaches of what was agreed. You will probably never need it, but if things do end up in mediation or court, dates and facts carry far more weight than memories. If the same disputes keep recurring, a mediator can help you agree firmer, more detailed arrangements rather than leaving you to fight each round alone.

One important distinction. If your ex ignores every boundary, monitors you, turns up uninvited, or uses the children to control you, that is beyond a boundary problem and may be coercive control, which is a form of domestic abuse. You do not have to manage that alone, and the support lines at the end of this page are free and confidential.

Looking after yourself while you hold the line

Holding a boundary takes energy, especially in the early weeks. Guilt is common, particularly if you spent years smoothing things over. Feeling guilty does not mean the boundary is wrong. It usually means the boundary is new.

Build in things that refill the tank: people who back you, sleep, movement, and time that has nothing to do with your ex at all. Our wellness and healing after divorce guide is a good companion here. The stronger you feel in yourself, the easier setting boundaries with your ex becomes.

Frequently asked questions

What are examples of boundaries to set with an ex?

Common examples include: communicating only by text or a co-parenting app, keeping messages about the children and logistics, no unannounced visits to your home, agreed handover times and locations, a set notice period for changing plans, and not discussing the old relationship or each other’s new partners. When you are setting boundaries with your ex, the right ones are those that address where your conflict actually happens.

How do I set boundaries with my ex without starting an argument?

State the boundary once, briefly and without blame, framed around your own behaviour: “I’ll be keeping messages to the kids and arrangements from now on.” Then do not debate it. Arguments usually start when we over-explain or respond to provocation. A boundary delivered calmly, and enforced quietly, gives an argument nothing to feed on.

Is it OK to cut off contact with my ex completely?

If you do not share children or unresolved finances, yes, no contact is a perfectly healthy choice. If you do share children, complete no contact is rarely practical, but you can come close with structured, minimal communication: one channel, children-only topics, and written arrangements so there is little left to discuss. If contact feels unsafe, speak to one of the support services listed below.

Can mediation help us agree boundaries?

Yes. Family mediation is designed for exactly this: it turns setting boundaries with your ex into written agreements on child arrangements, communication ground rules and finances, with an independent mediator, without going to court. Agreements can be recorded in a parenting plan. For child arrangements cases, the government’s mediation voucher contributes up to £500 per family towards the cost, and it is not means-tested (as of July 2026).

Every boundary you set is a small vote for the life you are building next. Keep casting them. You are allowed to protect your peace, and you are more than capable of doing it.