Honestly if you're dating a gay guy he wants another gay man, not a woman.
Unless he's a pansexual, bi or something.
So I think you either need to evaluate who you are or find someone else. But I wouldn't change myself just for someone else. My transition is for ME and me only. If I die alone, so be it, at least I'll die a woman and not a man. But I'm not motivated by anyone other than myself.
Talk to your therapist.
Good luck!