Need Advice

Hi girls! I need a little advice. I'm 19 and am 11 weeks pregnant and just found out my boyfriend (20) has been cheating on me because I haven't really been "in the mood" lately. Also though, I found out that when we first found out I was pregnant, he had bought these pills that he thought would kill my baby and was going to slip them in my drink 😡😕 I have broken it off with him. But he says he was scared and thought about it but through them away. Still, that's No excuse for threatening my baby and me behind my back. He says he wants to be a dad and wants to be apart of the baby's life. I don't want anything to do with him and I don't want him to have anything to do with my child and I'm just so stressed. He claims he is in love with me. And I don't care. I'm not getting back with him. But if he really wants to be apart of the child's life. I have to let him be. And I'm just having a very hard time excepting the fact that he gets to be in it all and have custody and such.  😔 Any advice?