Sorry, I'm a bit slow tonight. Are you talking about a friend or acquaintance who is distancing himself from you since you came out to him (or her)? Or is this someone you were hoping to become involved with? In which case, is he gay, straight, or bi?
If he's straight, it may simply be that he is not attracted to men. I know, speaking for myself, despite the fact that I am trans and fully understand what trans-people go through, if I were dating a guy who then told me that he is actually a woman, and is planning to transition, the romantic aspect of the relationship would probably be over. That may be shallow of me, but I'm simply not at all attracted to women, so once she started presenting as a woman, I would no longer find her appealing. I would hope to remain friends, but that would be the extent of it.
If he's gay, he may be reacting to the fact that you still look female. (I'm assuming you haven't started T since you were last here. Correct me if I'm wrong.) He might come around as you become more obviously masculine. Then again, a lot of gay men are seriously squicked by VJs, and he may never be able to overcome that.
If he's bi, then it's either prejudice, or he's just not that into you. Love is a fickle thing, alas.