Dumbfounded by my ex...

So this is gonna be kinda long guys, but I left my ex a month ago. I’ve been living with my sister since, but the reason I left is because he said he wanted to be able to see his kids. Me and the children’s mother did not get along just because i was with him even though she had a whole other fiancé and talking about trying to get pregnant by him. I moved 5 states away and worked my ass off everyday all day to help support his children. I would send all 3 of the kids my money every Monday. The money never went to the kids as we later found out, she was spending it on her fiancé and their stuff to go party or whatever. And that came from her mother. Well since I left him he has neglected to see his kids. At all. Making up all kinds of excuses and what not. But my problem is, if he didn’t want me, why didn’t he just leave? Why drag out the whole relationship for over a year and a half and make me pack my things out of my house. The house is in my name, the lights are in my name, and the water is in my name. I had to leave a lot of my things behind due to the fact my sister doesn’t have room for my whole my house. I’m just really upset that he made me leave my own house just so he can continue to not see his kids.