My relationship is effed

My boyfriend/baby daddy is bisexual. He just came out to his family. But now he’s downloading text now and sending my nudes and our sex videos and his nudes to HIS BROTHER! He pretended to be a random person and get nudes from his brother by sending these things. I have a 5 month old baby boy and I’m honestly terrified that something is going to happen to my son if this is how he acts with his brother. We no longer have sex because of a prior incident with leaking nudes and videos. I don’t think our relationship can go on anymore but at the same time I feel stuck, A) because he’s constantly suicidal B) he goes manic and never remembers anything. He’s kicked me and hit me just for trying to wake him to ask him for help with taking the dog out or helping with the baby. Please give me advise I need out but I feel forced to stay.