My situation is rather complicated. To keep it as simple as possible, I live in PA and was with someone from 2009 until 2014. It was initially a long distance relationship with him being in CA. I moved there and we had our daughter in 2011. Having dealt with alot of emotional and mental abuse from my ex, I left for home with my daughter to get away from the relationship. After 3 months he convinced me to try again and he moved to pa. For obvious reasons it didn't work out and in late 2013 early 2014( not sure when exactly) he went back to CA after I broke it off for the last time. Initially my daughter was staying with me but again was convinced by him that we would do 50/50 custody with him taking her first. He left and after 3 months cut contact with me and wouldn't let me know where they were. I filed for custody in pa and after finding a location, drove to CA to serve him and retrieve my daughter. A while after bringing her back to pa, he signed the custody papers giving me primary custody and him the 2 months of summer. Over the next 8 years we had varied contact with my ex, all by his choice. There would be long periods of time where he wouldn't contact her with short periods of "lovebombing". Around when she was 8 or 9 he started with the mind games and was doing his best to poison this home for her. She went from being happy and carefree to wothfmdraw and resentful. At a certain point I felt like I was doing her more harm forcing her to stay here so I regretfully allowed her to move in with her father in CA. Over the last 3 years I went from being able to talk to her whenever to her not wanting to talk to me at all. And that brings us to now where he is asking for child support, something I never asked of him. We have never discussed anything in regards to it until recently when he demanded 400 a month and back pay( via text). I have not recieved any papers or summons from CA and I'm not sure what to make for the situation. Any advice would be helpful.