Sounds to me like typical addict behavior. Our addicts are what they are.
Best advice I can give you based on my experience is to run & don't look back. If you continue to contact him or even follow his social media simply expect to get hurt. If you want to end the hurt then let him be to go live his own life.
I know its all very difficult. You have to take care of you. He isn't going to do it.
I'm sorry for your situation.