Dad cheated and is now suicidal

I posted last night about my dad cheating on my mom.

If you havent read it basically my dad was caught messaging another woman on Facebook my mom found the messages. He then tried to say it was a joke and he was trying to make my mom jealous. My mom messaged the woman to confront her as well but nothing about a joke was said to her he just made that up. I didnt mention it in the last post but he had cheated on her before when I was really young they were in their 20s at the time when she forgave him.

He came back to talk to my mom today but she still wants the divorce. I tried to tell him bye but he looked me in the face and told me it was my fault that they aren’t getting back together and that I made things worse. The only thing I done was I comforted her and held her while she cried in my arms over him. He also said if my mom doesn’t let him come home he’s gonna kill himself... I know it’s not my fault even my mom told me it wasnt my fault. Idk what to do. This whole thing has me so stressed out 😔

* I’m 22