I'm guessing this guy was secretly thinking (or at least, fantasizing) that the two of you would end up together and your suddenly being in a relationship with someone else made him think, "Oh, god, I've got to get her thinking of me like a 'potential boyfriend' rather than a 'friend' now, it may already be too late!"
It also sounds like said guy-friend is really inexperienced with the opposite sex and about as smooth as a pine cone stuck superglued to a porcupine. He was probably putting himself in a corner when you were around because he was terrified of saying the wrong thing to you and screwing up his imagined chances of things "progressing" between the two of you.
In short, he's kind of pathetic, but he's probably not trying to be an ass to you; he just doesn't know how to act on his feelings, nor does he probably have the emotional maturity to recognize that the way he's acting now is a) not going to make you suddenly attracted to him and b) creeping you out.
I guess the question is whether you think he's dangerous, because it may be time for something between "I value your friendship, but we are never going to be anything more than friends" and "You need to back the #@$% off because you're making me want to file a restaining order."
It also sounds like said guy-friend is really inexperienced with the opposite sex and about as smooth as a pine cone stuck superglued to a porcupine. He was probably putting himself in a corner when you were around because he was terrified of saying the wrong thing to you and screwing up his imagined chances of things "progressing" between the two of you.
In short, he's kind of pathetic, but he's probably not trying to be an ass to you; he just doesn't know how to act on his feelings, nor does he probably have the emotional maturity to recognize that the way he's acting now is a) not going to make you suddenly attracted to him and b) creeping you out.
I guess the question is whether you think he's dangerous, because it may be time for something between "I value your friendship, but we are never going to be anything more than friends" and "You need to back the #@$% off because you're making me want to file a restaining order."