Dating someone in Anger Management.

So I started seeing this amazing guy. On the first date in the spirit of full disclosure he told me he goes to counseling regularly and he's in Anger Management. He lost his mother a couple years ago and he said he's still dealing with that so hence the counseling. As far as the anger goes, he says he is not violent, he has never and would never hurt someone. He said when he gets angry he just says really mean things in the heat of the moment. He said his anger management counselor thinks his anger is also rooted in feelings he hasn't dealt with about losing his mom. I totally respect it because mental health is so important and the fact that he is getting help is admirable. I've had my own history with mental health so I get it. I'm just curious if any of you have been in a relationship with someone who is in anger management. How did you deal with it and how can I make it easier on him/show my support?