The first thing I would do is call or email your employer and ask if you can agree to describe your departure as mutual (in the future, you should do this when leaving a job anytime the circumstances are unclear). You need to know what they're going to say about you, because I believe most bar applications also ask this question.
If it can't be "mutual," you need to basically make sure your story jives with your ex-employer's, because there's the possibility they will be called.
Sorry, dude--I once worked for a crazy person for like five months. I left on my own, but I think the bar app people will call all past employers... and this guy was seriously nuts, so there's no telling what he'll say.