Manipulative ex ! Bout to explode

I have an manipulative ex, I still try to be civil with him for our daughters sake but at the end of the day it is draining me. For an instance, we haven't been together for almost 12 months, he has been seeing a number of girls since then, first one being 2 weeks after we broke it off. I started seeing a guy about 2 months ago, since he found out he stopped keeping contact with his 'girls' now just to be able to give me shit about moving on, saying it's wrong and constantly mentioning my new guy and reminding me I'm the only one seeing someone & keeping our family apart. This is just one instance but it's plain to see he has something to say about EVERYTHING I do or say but when he's done it it's okay. I hate him but he is the father of my kids and they love him, I just don't know how much of him I can handle anymore without absolutely losing my shit! Sorry just needed to vent girls xx