Just to reiterate what most have said...he doesn't deserve an apology. At all. He didn't think to care about having a decent breakup or to discuss what made him so unhappy in person. Like you hinted at, things didn't have to end the way they did. Personally, like you, I can't deal with that type of behavior either. Like others have said it shows how immature & thoughtless he is that he couldn't do this face to face. Especially after so much investment. If anything, it should be the other way around. He should be the one apologizing to you. I wouldn't want to be friends with someone who disrespected me on such a great level, much less continue to have contact with them.