I hate being in my own thoughts

We’ve been over for about 4 or 5 months now and he got with someone else about 3 months ago. We were together for a long time so sometimes I struggle to understand why he moved on so quick. Like I just don’t get how he can quit on us, we were a family and now it’s gone. And he’s with someone else. He was horrible to me during the relationship and during the day I’m fine because I have things going on that keeps me busy. But at night I start thinking about everything and I don’t feel sad that it’s gone, I feel sad that he was so abusive but gets to move on and be happy with someone else while I’m lonely and deserve to be happy. I just don’t get it

@A this is what I think too. Nothing surprises me with him anymore. I don’t even care about that anymore I just hate the fact that he gets to be happy and I’m the one that did nothing wrong but I don’t get to be happy. It sucks