In this instance he wasn't suspicious of me, and he can flip on a dime and become very hostile over what he believes are threats to his ego. He's not physically abusive.

I do believe he has SOME sort of disorder. What, I am not 100% sure but I can see aspects of many in him. Year or so ago we were at a comedy club and I put my hand on his head laughing at some joke having a great time not thinking anything.

Immediately I heard "you're a ****ing ***** for doing that to me"

Then cue hours and hours of being verbally berated. He believed I did this in response to a joke about a small penis, and was making a mockery of him.