SO Help

I don’t know what’s gotten into me, after having my baby every little thing he does just makes me mad, he lies about everything he’s doing, going, etc. he goes out late at night, he never wants to be home with me and my 4 month old, she doesn’t even know who he is, and he’ll get upset. All he does is smoke weed, I mean like 4x’s a day, he is always complaining to me, about myself. Always making fun of my mental illness, like it’s a joke. You guys I don’t know what to do. I can’t help but be mean to him, or dislike him because of the things he does.