So the father of my daughters and I have been apart for 4 1/2 years and since then I've had physical custody of the girls. he had visitation and such. So when the girls went with him for the summer I had gotten into a relationship I thought was good for both and me the girls. Well needless to say after they came back we broke up shortly after. Now from time to time my youngest daughter who's almost 3 asks me where batman (my ex) is. I tel her he's at work and such. As of November I lost physical custody of my girls and now their father has them, and every time my youngest asks where my ex is he gets extremely pissed off and take it out on me. This is the reason why we split. His reasoning is if I can't have you no one can. I don't want my daughters around this crap. Any suggestions?
You can't do anything to change your ex. Your ex is going to be as pleasant or as ugly as he wishes to be.
All you can do is make sure to be the best parent you can be. Don't bad mouth your ex, try not to introduce your kids to SOs unless it is going to be permanant, and in general take the higher road. You have no control over the ex, just yourself, so do your best and your kids will sort things out and have tangible proof of your love and care for them.