I can't take it anymore!

I want to leave my husband, I can't do this anymore. We've only been married for 2 years and in those 2 years we've been separated so many times but now I'm pregnant and I just can't. He's out every weekend and even during the week I believe he's cheating on me but I have no proof. But he's mean and unapologetic and uses my new car to do he's cheating errands. I'm 6 months pregnant now and my son doesn't even have a sock he always says he's going to buy stuff but spends his money on friends and alcohol. I want to leave but I don't work I'm studying to be a teacher and so I know ima be okay. What can I do?