Broken hearted

So here’s my story .. I met a boy at a basketball game when I was 13 my parents didn’t let me date at that time and “my best friend” was dating him but I didn’t know. I started to talk to him until I found out then I kept my distance but became friends. My best friend cheated on him and he came to me in that case we got close we went out but I kept leaving him cuz of my parents every though I still went back to him. I had his baby in 2016 he left me two weeks after I had his baby I was so depressed but then I moved on until January 2017 he came back saying he wanted to give it a try and I said yes because I love this guy man. He hardly sees his child. I left my baby with his mom so she can watch while I still go to school cuz I’m still in high school, I left him there so his father can see him more often . I dumped in around in August because of the way he drinks and the way he talks to me he tells me I’m a whore this and that when he’s the only guy I’ve been with. But everytime we argue he brings up how I used to always leave him back in 2013 but I was 13 my first relationship I didn’t even know what that was you know? And I was the ugly duck at school I thought he was playing me but I fell for him. So moving on to just yesterday or the day before that which was November 24; he ignored me all day until I texted him he didn’t reply until yesterday morning and I texted back he didn’t reply but then I find out that he is talking to his ex which would be my ex best friend right so I just told him to not even talk to me.. no response . Okay cool. There’s this girl that has been trying to get at him she’s 14 or 15 and she’s best friends with his brother and is always around their family. Just yesterday she was sending me snaps about how she’s been with him and him all drunk saying they slept together and not just that his own brother also sends me snapchat videos of them but he hasn’t texted me back .. I’m really heart broken and I just needed someone to tell me what to do cuz I’m really hurting . NO RUDE COMMENTS THQNK YOU