<human>: Provide a brief overview of the text.

I am a girl, senior in high school. Two years ago, my best friend and I liked the same guy. We both fell for him pretty hard, but tried to not let it get between us. She and him started dating, I was fine with it and tried to move on.

He apparently took my attempts to seduce him as invitations to a friendship, because shortly after they started dating (perhaps because they started dating?) me and him became best friends. This would normally have been fine, were it not for the fact that in such proximity to him, with him making out with my best friend, it was very hard to get over him. In fact, I didn't. At all. We just became best friends, cuddling and having inside jokes. 

This circumstance causes quite a few awkward situations and conflicts to which only I am aware namely; they both come to me to talk about their relationship. And the problems with their relationship. And their sex life. And problems with their sex life. The problem being that they don't have one.

Anyways, to catch us up to the present, she has changed. It is so hard to be close with her, because she has become introverted, self-conscious and violently temperamental.  Struggling to make his relationship work, he has turned to me. He tells me everything, including his complaints about her and all of his secrets. He hugs me, says I'm beautiful, says he can't live without me, and tells me he loves me all the time.

He loves her more than anything. But he does love me. More than as a friend. I know it... He just doesn't.

But here is the real issue; I am conflicted. When he comes to me for relationship advice, the part of me that is best friends with her says "He is all she has! They have to stay together!" and the part of me that is his best friend says "They need to talk it out! This relationship is killing him!" and the part of me that is in love with him says "Break them up! You can make him so much happier!"
<bot>: My best friends are dating, I'm in love with him. What can I do to be happy, and avoid being an awful person?