Partner threatening to off himself if i leave

Okay so I'm 19F and he is 19M. I am currently 20 weeks pregnant with his baby. I have tried to break up with him but every single time he ends up in the hospital. Most recently he took over 100 meds just to die. He told me it was my fault and I'm evil. He sent me videos of him with the meds and was saying things like "imagine you could have stopped this but instead you're choosing to let me do this instead of being with me because I'm so bad". He tells me he loves me. He's threatened me with socials multiple times to take my kid away. The other day he literally said to me that I have a choice, either I stay with him and he will live, all his issues will be solved, or I stay, and im choosing for him to take his life. Before anyone says to call his family, I have. I've called and they are stuck on what to do too. When he makes attempts I always call an ambulance. This has happened so many times. I have trauma involving death and suicide and he's aware of this. One of the first times it happened it was at my place and he was jamming all the meds he possibly could in his mouth and was listing reasons why it was on me. Another time. He saw I liked a tiktok that he didn't want me to like and was taking a lighter to his eye, took meds, drank bleach. Yes I called for help. The police actually ended up taking him to the hospital. He does have mh issues and I've spent the entire relationship helping him with that. When these moments happen and it's bad because of my own trauma and mental health it triggers my ptsd really bad and it's like torture. I know he needs help but so do I. The relationship is toxic in so many other ways too and I'm terrified of my child going through that. I feel like my only out is to protect myself but he's calling me selfish and manipulative and a narcissist and maybe I am. I feel trapped and feel like the only way I can escape is by getting help from social services to protect myself and my child but am I blowing this out of proportion? I feel like if I do that he might lose the ability to see his kid and I feel so much guilt for that. What if he does actually commit I wouldn't survive being the reason for that because how could anyone. I know I'm running out of time to make the right decision I just don't know what that is. For perspective. He believes that together we can work on our problems and be a whole and a family for the kid. When I try to explain that this has been said before and im worried that it might get bad again and I don't want my son the experience thus as a childhood he flips out. If I suggest we take some time apart to work on ourselves and try it again together when we are both more stable he says no and says he can't get better without me because I numb the pain and if I leave I want him to be in pain and ultimately kill himself. I'm sorry this is long but it's so complicated and I do not know what to do. I feel like if I reach out to someone it will ruin his life and I actually do not want that for him. Please give me some unbiased advice.