Most Helpful Guy
I agree that you should leave him alone. It's not for him, though, it's for you. It may be nice to stay in touch with someone you were once really close to, but that's reserved for amicable breakups where you've simply grown apart, have different priorities in life, need to move away, etc.
It's unclear why he would be mad at you. I only know your side of the story but, based on that, I'd say he's a selfish douche bag who has no right to be mad. Maybe you need to look no further than that as the explanation.