How to get over it

Me

So I met someone who soon became my daddy and it was going great. He treated me like a princess and was so nice to me. A few months later he started distancing himself off and I knew something was wrong. He had found someone else (he is now dating her) I can’t go into little space anymore without being reminded of him and bawling my eyes out. Me and him are still friends but when he is with her he just forgets about me. I can’t look at my pacis without crying or getting upset. Has anyone else been in this position and have tips on how to get over it ?