My sympathies. I had a very close male friend in college whom I'd hang out with almost every day. I think at the time we were too immature to explain why we never ended up together, but now, looking back, I think it was because we really loved each other too much and were too incompatible. Namely, that if we'd gotten into a romantic relationship, it would have ended badly, but as brother/sister best friends, it could go on forever.
Except he married a woman who hates me and I almost never hear from him anymore. I know I'm not the only female friend who's gotten the silent treatment from him since his marriage, either. Apparently she doesn't like him having female friends.