Cheating husband

Hi there. I am so blue. I found out my husband is hiding something major and I think he is cheating. He supposedly is going on a business trip next week. I have had my suspicions for a while because he is acting exactly the same as when he had a fling many years ago. So I went looking, knowing I shouldn't. I found self bought tickets to another city than he said he would go to. I logged into his work laptop and found out he took vacation days off for the time he is supposed to be on a business trip. Plus the coworker he was supposed to go with is just gonna be at work at that time. I confronted him with just the tickets and he abused me. I have bruised ribs, shoulder and wrist. Plus he strangled me and threatened to kill me holding a knife an inch away from my chest. So now I know I have a cheating husband and I am scared to death. I think he might have serious mental issues like psychopath or narcissism. I can either pretend everything is ok or run away some place far and never see my family again. Please don't judge me. I am in so much pain right now. Any advice or helping words? Please pray for me.