I don't know. If you get signals that tell you it's a bad idea to confess, it probably is. I don't know why a love-confession suddenly provides carte blanche to second-guess instinct. It isn't just that one might be rejected, a painful experience, but there is also the whole social element of friends, family, colleagues or schoolmates, and often in the case of a gay relationship, cultural antipathy, although thankfully that's breaking down. I say, be smart and follow your instincts.
I did it before. And now I lost my best friend. ( T_T)
Because real life =/= yaoi's world.
I find it so sad when you notice you lost all these years thinking the other party isn't interested in you.... That's why I think you have to try confessing because if you don't, it's already a no, at least trying you have 50% to get a yes