How to do it...???

I need some advice on how to potentially break up with someone who has a really bad temper. I’m not worried about me, he’d never lay a hand on me but he would hurt himself (punching walls, throwing phones or other objects, punching himself). He had a crappy child hood so he got really used to taking his anger out on his walls or if he got mad enough a few times it would be himself that he physically took it out on. Plus I’m scared he may become severely depressed and possibly suicidal. I still love him and never want him hurt but because of religious and personal family reasons this 4 year relationship may not work out. Help a girl out because I don’t want the man I love to do something stupid.