Yes absolutely, as you said, he didn't ask you when he moved someone in with him, so would should you have to do any different? If his concern is whether your DD and DP get along, then I could understand it slightly more, but to me it sounds like although he doesn't want you, he doesn't want anyone else to. I think you should just say look, DD gets on really well with DP and thats all you need to know, you get on with your life and I'll get on with me. No doubt they are bound to meet at some stage anyway if your ex calls to collect DD, so whats his problem? Anyway, glad you sorted things with your DP, sounds like you have been very mature and sensible about the decisions you have made, so I hope all works out really well for you.