Yes. Good friends of mine who had relationships with women; met some new friends. Both ended their relationships and ended up with boys. One is still with the same guy; the other regrets giving up the girl (she was a great gal with money), lives alone and has guys moving in and out ever couple of months.
Cureable? If everyone had stayed in the closet, these guys would be married with kids. Would they go back? Probably not; but could, I think.
Your friends are or were most likely bi-sexual.