1. Bromance is doing everything with your best friend. Let's just say that you hang out with your friend and say that you go fishing, that's bromance. Homosexually involves a physical attraction of two (same sex people [men or women]). They may have some similar interest.
2. No, if you are physically and emtionally attracted to someone, it is hard to remain "just friends." Being in a relationship is one level and "just friends" is on antoner level. I am not throwing this in to sound bad, but two "friend" cannot have a sexual relationship on that level.
3. No, again if you go into a commited relationship with a long time friend, the person can ruin a good friendship that took years to establish. I am not trying to say don't date a friend, but be careful.