Hey OP, I'm with >>11 on this one.

And also one advice - stay close to your friend buddy (not K). It's way more probable that you'll stay close to him than to her. Don't hate him like you said for "taking the heart of your dream girl". If you really feel like you need to have a grudge, then lay it on her for not liking you in the first place. Yes, it's not really "logical", but it's the best you can do. It's the best way to heal, and the best way to strenghten the bonds with your friend. If you can forgive him that, you'll see what I mean.

I'm not talking out of nothing, almost the same situation happened to me (although in my early 20s). I forgave my friend, and one day at a party we talked about it for some reason. I told him that it was probably the best thing I could do, and was happy with my decision. He told me that he never wanted to force the subject, but that he was very happy and respectful that I took it that way.

TL;DR: Friends > Failed relationships.