Relationship advice

Okay so I met my boyfriend/kids father when I was 16 and he was 15 . We are now 19 . (His birthday is today) when I first met him he jut can back from placement (juvenile detention) I believe he’s been in and out of placement ever since he was like 12 .. he comes from that type of home , him and most of his brothers Been to jail. Fast forward I got pregnant 4 months of dating , I was like 6 months pregnant when he went back to placement came home when our daughter was 3 months , came out went back blah blah . Got pregnant AGAIN . he went to placement this time last year on the 8th . I was 10 weeks pregnant . He’s been in placement ever since . Our son is now 5months . He could’ve came home about 2 times since last year but HE KEEPS FIGHTING THE PLACEMENT STAFF !!! today’s his 19th birthday and I got a call from the placement he’s at . I automatically think it’s him so I just answer he phone and say happy birthday . Well it wasn’t him . It was his counselor telling me he won’t be on the phone for a while , he’s locked him his room , he assaulted staff members they had to go to the hospital. They are going to most likely press charges and send him to the county jail . So like I said early this is the 3rd time he assaulted staff . BUT , he also be telling me that staff be hitting them, they be choking them and everything so idk .. I believe him because there’s been a placement where I live that caught a lawsuit because they be abusing the boys there . But I just wanted to break down and cry , it’s taking him forever to learn and grow up . I’m tired of being a single mom . I’m struggling being 19 with 2 kids !! I also want to add that he’s adopted. By his grandma. She took him when she was in her 60’s . His mom isn’t around and his dad stays in jail . So I understand why he act the way he do . I just had to learn how my dad being in jail my whole life affected me (it affected me boy wise) so I don’t wanna just give up on him . But idk . Any advice ? Thank you in advance