Me and my ex split in November, now that we are separated I have found out he is dating someone new. But I also found out that their relationship started before ours ended so he was cheating. He is now staying with her part time (may already have moved in) so my question is can she pay me some sort of monthly payment? As I have 2 kids with my ex. I keep our kids full time and he hasn't seen our kids since our split.