I don't understand all the, "You must not contact her!" comments. Very puzzling. You are an adult, you are allowed to decide for yourself who who want to be in contact with. Of course, it depends on the reason for the break up, to some extent. If the partner cheated, then no, I wouldn't stay in contact. But if its just a natural ending of the relationship, albeit, one that your DD isn't haapy about, then I can't see a problem. I'm still friends with one of my DD's ex-g/f's. We always got along well, and had similar interests. No, my daughter doesn't like it but I decide who I'm friends with. We don't chat often, and I never discuss my DD with her. She's in a new relationship now and seems very happy. I was also friends with an ex-g/f of my DS. He was fine with that, had no problem at all. They did reignite their relationship after a few years, and I was very happy for them. However, she ended up cheating on him and the broke up again. At that point my DS did ask that I not talk to her anymore, but to be honest I had no intention of doing so again anyway, after what she had done. So yes, it totally depends on the reasons behind the break up. Looking at it from the other side, I would never order my kids not to speak to one of my exes (ironically, my DD is still very friendly with one of my exes, despite not wanting me to have the same freedom). At the end of the day, what right do I have to dictate who they can and cannot talk to? And that should work both ways....