What do you do if your best friend's boyfriend likes you?

Basically, my friend has been dating this guy for almost 5 months now, and I have become good friends with him through my relation with her. Only thing is, her boyfriend apparently has liked me since the beginning of the year, way before he even remotely considered her. He actually was going to ask me out, but was informed at that time I had a boyfriend.

Then, he turned his attentions to my friend. I hadn't even talked to him, and I had no idea he liked me. The first time I talked to him, was when I was introduced to him by my friend on their first date.

We became friends, he owned up to his feelings, and I realized I had feelings that reciprocated. So, now I'm stuck in the worst kind of stereotypical love triangle. I love my best friend and would never want to hurt her, but I like this guy SO much, and he likes me back equally, and my friend loves us both.

It is terrible. So, my friend's boyfriend still flirts with me and we hang out. We don't do anything. EVER. I would never hurt my friend. But, we can't help the flirting. And he keeps initiating get togethers, saying how he misses me.

It's not fair to either me, or my friend. I know this. I just can't seem to do anything about it. It has gotten to the point where I can't even look at them when they are holding hands, let alone making out.

WHAT DO I DO?!?!?
What do you do if your best friend's boyfriend likes you?
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