Generally, no. Being honest about a new relationship builds trust and prevents painful discoveries later. Tell your ex before the kids find out from someone else. Keep it neutral, matter-of-fact, and focused only on what affects them as co-parents. Secrecy causes more damage than the conversation ever will.
Secrets in co-parenting blow up worse than the actual relationship ever could. Your ex will find out eventually — they always do. And when they do, the betrayal stings harder than the relationship itself would have. Kids adjust better when they're told upfront, rather than piecing it together from a classmate's comment or a photo they weren't supposed to see. One father's ex discovered his girlfriend had been part of the kids' daily life for six months when their daughter casually mentioned her name at dinner. What followed was months of conflict, broken trust, and tense handoffs that never needed to happen. A simple conversation earlier would have cost him ten uncomfortable minutes instead. Hidden relationships also wreck the practical side of co-parenting. Scheduling falls apart. Surprise visits get awkward fast. Every logistics conversation quietly turns into a minefield because one person is working around a secret. Your ex isn't asking for access to your diary. They need basic information to co-parent effectively and help your kids adjust without feeling blindsided.
The conversation stops being optional in a few specific situations. Your kids are about to meet this person — overnight stays, school pickups, holiday dinners. Your ex has a pattern of finding out through the grapevine before hearing it from you. Or your custody agreement already spells out exactly how new partners get introduced. Context matters here. A parent seeing someone three nights a week is in a completely different position than someone who went on two dates. These aren't the same situation, and the urgency isn't the same either. But there's one line that matters regardless of how casual things are: if your kids ask you directly about your dating life and you dodge it, that's not discretion anymore. That's lying to your children. Staying quiet stops being a choice and becomes active deception — and kids pick up on that faster than most parents expect.
Here's what most people get wrong. Telling your ex doesn't mean asking for permission or their blessing. You're informing them of a fact. Your romantic life stays yours. People also think mentioning a new relationship will hurt the kids or mess with custody arrangements. The research doesn't back that up. What actually harms kids is conflict, deception, and forced secrecy around adults. Parents sometimes think they're protecting their ex's feelings by staying quiet. That's not co-parenting. That's enmeshment, and it's not your job. Another mistake: waiting until things feel "serious" before mentioning anything. That timeline is yours to define, but the hiding itself causes the damage. Even casual dating doesn't need to stay secret if there's regular contact with your children.
Their reaction isn't yours to manage. You're delivering information, not asking for approval. Keep it brief, stay neutral, and focus only on anything that directly affects the kids. Don't over-explain or get defensive — that signals you think you've done something wrong, and you haven't.
Pull it out and actually read it. A lot of agreements include specific language around new partners — waiting periods before introductions, required notice before sleepovers, that kind of thing. If yours does, those terms are legally binding, not suggestions. Ignoring them quietly doesn't make them go away.
Pick a neutral channel — text or email works fine if in-person feels like too much. Keep it simple: 'Wanted to let you know I'm dating someone. We're taking it slow, and I'll flag anything that affects the kids.' That's the whole message. No extra detail, no justification. Short is better here.