Most Helpful Guy
It depends where he's at in life. I think every guy will have a few rejections that really hurt him. Especially if it's been one where he's gotten his hopes up and put in effort. I suspect that could be the case with this guy.
However don't worry, that's life. He'll get over it and he may well be prepared to be friends with you afterwards. But he's probably hurting now and the best thing you can do for him is give him space.
I'm at a point now where I couldn't care less about rejection. Doesn't bother me in the slightest. However this is after time. When I was younger I had a big rejection, she basically lost interest, and I bawled my eyes out, lol. But it took situations like that to get to the point I'm at now, and I'm thankful for that.