How to I stay calm about all this?

I took my baby daddy off the lease of my apartment and told him he needs to leave after he refuses to accept that what he is doing is abuse to my kids. I have done my part on putting him out but he doesn't seem willing on actually changing his fixed mindset for better. I know what I have to do and have done but i just wanna know what other mothers would do. We have a child together and on our second. I have given him a year and a half to straighten out and grow up. There's more to this but I feel like he will never understand so how can i have a positive reinforcement for myself to stay calm about all of this