Relationship

I’m 17 and 14+2 weeks pregnant. It’s 3:15 am and the father to my kid left me. Apparently I’m a fucking loser and I’m disgusting and he thinks he’s going to get full custody of the kid but he’s a fisherman and does drugs. I thought he was clean but I found coke in his wallet tonight and he says it isn’t his but the way hes acting it’s very obvious it’s his and he was upset when I found it. He was drunk too, he used to be an alcoholic but then he stopped and now I see that he’s on that path again. I’m so heartbroken and I’ve been crying for 3 hours and I don’t know what to do. I know I should leave him but I love him and I don’t want to but he yells at me all the time and it’s not healthy and I know I deserve better.