What would you do if your gf/bf/fiancee/spouse told you they were a transexual?

You looked better as a girl anyways :P

Well, id be upset...and especially at myself for not realizing it sooner. Surgery or no, ive seen enough vaginas in my day to notice the difference in my opinion...hopefully :|

I'd be extremely upset and feel betrayed that they would let the relationship go so far and then tell me. I'd break it off and probably be more wary of future relationships.