Please don't walk...run from this toxic person. I know you still care about him but he's just really bad news and I think deep down you know it. Please work with your psychologist in processing the pain that is leading to the cutting. You deserve so much better.
Block him, ignore him or whatever you have to do to cut this guy off. I know you are grieving a loss and it's hard and painful but do you really want a guy with so many red flags who the majority of your support system gives a thumbs down to?
I hope you work through this and find somebody worthy of your time and affection. Sending big hugs.