Must. Kill. Feelings.

So I'll jump right in. I have this friend who I've known for a few years. He's not the best looking or sharpest tool in the shed, but he's a really good guy. We've become really close over the years, and our friendship is killing me. He's more emotional than most guys and he opens up to me often. I've learned that he feels and deals with a lot of the things that I feel and deal with. He disarms me and sees through my facades, and I can pretty much read his mind too. We've been through a lot of things together and it hurts me a lot to know that he's straight.I've hinted at having feelings towards him, and while he does not feel bothered by it, he says that he can't be with me. I know this but my feelings for him are still intense. He says these lines like they're straight out of a movie or anime and it just hits me in the chest. He's oblivious to how charming he comes across at times. It makes it hard to not fall for him. But I don't want these feelings. I'm happy enough being his friend, but my heart seems to want something more. I've been through this sort of thing before with other straight guys, but none have been this bad before. He's all I think about some days, and it's just gotten to a point where it's just sad now.How do I handle these feelings? I just want to be cool with being friends. I don't want to ruin my friendship.