Husband harmed my ex

My husband has always been extremely jealous because I used to date my brothers best friend. We were on and off for 5 years. Lost our virginity to each other. And it was a very serious relationship. When we officially called it off of course my brother didn't stop being friends with him. He and my brother live together and we see them from time to time and my husband always accuses him if wanting me back and he has said he doesn't have feelings for me. My husband has also accused me of wanting to be with him. Even while I was pregnant with our first baby. I just had our son and my husband has continued his jealousy nonsense. We are currently living with my mom for reasons and my brother and his best friend just moved in with my mom because their home had flooded and they are staying for a while. My husband was angry and my mom told her it's her house. I understand why he's upset. Nobody wants their ex living with their spouse but he needs to just trust me. He's started fights with me over this while I was breastfeeding.

Anyway my husband went out with friends drinking and he ended up driving home drunk. We were all asleep and we woke up to screaming. My ex was showering after getting off from work. My husband was drinking out with his friends and was festering in his own anger and drove home and went to the bathroom, saw my ex in the shower and started beating on him and stabbed him with a pocket knife. Completely unprovoked. My mom ran to the bathroom and she ended up tasing my husband. She yelled at me to stay in the room with the baby. I had to watched my husband be taken in hand cuffs and my ex taken out b. y ambulance. This all happened two days ago. My ex is still in the hospital and if he dies it's a murder charge. My husband has been trying to talk it out with me.. he said he was so drunk he wasn't thinkijg. My brother said if I stay with my husband i am dead to him. Im 4 weeks pp. Already had to go to the hospital because my C-section scar came open. I can't cope with this. I'm going to call my old therapist to try to get back on her books. I'm trying so hard to navigate this. And I feel like for some reason it's all my fault that my husband is behind bars and that my ex may die