((Junerain)) - I'm sorry ths is happening. Whenever I hear about a big fight that happens from past relationships - remember you're hearing his side only. If he participated in a fight where the police were called - it sounds like he might have a nasty side.

I think you're right in asking him to leave, while this is sorted out - you can still be friends. If I were you - I would talk to his ex and learn more about him. This is way too much drama for you.