I am in the SAME boat, just about a few months before where you are...
I've been with my FTM pre-T boyfriend for about a year now, and I am head over heals for the woman...tomboy I see him as. I love her voice, her shape, her hair and lack of in some sense.
It's painful to see someone you fell so much in love with...change before your eyes. The voice that use to make you melt slowly vanishes into something foreign...It makes me want to cry just thinking about it. But I also can't stand seeing her/him so depressed, always wanted to die, crying, never wanting to be seen cause they can't stand how they look...*sigh* sometimes it's hard for me to think I love the person inside, not just their outside.
Do you still feel attracted to them? Or maybe you are holding onto the past, like when you grew out of your favorite pair of jeans when you grew up?
It brings me to tears thinking about what you're going through, as well as what's ahead of me...I fear deeply that my little girl will turn into something completely different. Lose that adorable lame sense of humor, lose that little pout she gets when she wants something and I have all the money.
I have been a lesbian my whole life...and the thought of being called "straight" is very...off-putting as well. I still don't know if I'll be attracted to her once she's been on T anymore...
So just know, there is someone else in your spot, and is about to walk your path. If you need a chat, feel free to add me on MSN or send me a PM or anything. I know it's good to have someone to talk to that's going through the same as you.
Good luck