hahahaha..
well, most of these relationship related queries are incomplete, without listening to BOTH sides of the stories. i don't intend to sympathize for guy A but what  if, unknowingly or indeliberately, YOU had given him hints of  liking (more than a friend) towards him?
it's a sensitive issue and there are some human emotions which flow without much control and you tend to give them your tacit approval. that is why, i believe it is sometimes good or rather safe to be EXPLICIT with these kind of emotions to check any undue future jeopardy due to mere confusion, meaning, it does not hurt telling your friends about what sort of regards you have for them.

i am sure most of the peeps who will reply to this thread will, based on what you wrote, speak in favor of you so i am just providing them another face of the matter, which is not as trivial as the face you presented. see where i am coming from?

and no, not all guys are same. even with the same guy: age, maturity, place, condition, and people around him make a lot of difference.