Signed Joint and Several Lease with a sociopathic, harassing roommate. I moved out and want to avoid courtHelp?

2 months into my joint and several lease I had a confrontation that was bordering on violence with my sociopathic roommate. He blew up after I told him no to throw away my food without asking first he was yelling at me calling me names and punching his fist. He is 6'3 close to 300lb with a bad temper and I'm about half his size so it's a no win situation for me. He also used the a racial slur towards the Hispanic neighbors upstairs by calling them N right to their face. So his anger streak is no secret to anyone. I texted him that I would like to find a replacement roommate, he replied that he will go after me and my family if I were to move out and made other threats as well which are all on my phone. He said that he stole all my personal info from my room my SS#, addresses etc and would use it to sue me. I made the landlord aware that I want to move out and he said he was fine with it. I moved out. My ex-roommate continues to send me texts asking for money and threatening me that he knows where I live. I told him that I've called the cops and made them aware of his harassment. Now he says that he will sue me for the remainder of the rent. I told him to use my deposit of 1000 dollars to pay the next 1.5 months of rent and find another roommate. He continues to insist that he wants me to pay and doesn't want another roommate. The lease is joint and several but I can't live in the apartment with a sociopath. The landlord will evict all if the rent is not paid. If my ex-roommate choses to pay rent by himself and go after me in court can I win? P.S. this guy is a real sociopath so he'd rather sue me than get another roommate. My rent share was $750 per month.