Sorry for the late response.
I have to admit, I was similar towards my partner when I first decided to transition. But honestly,
it was all me. I was hetero before transitioning and I'm now a gay FTM, but my partner is a FTM/female-bodied non-binary, which is something that I had to get used to. I've never found the female body attractive, and I had to move past that in order to be able to be intimate in any way towards him. He thought it was that I wasn't attractive to him (he has self-esteem issues about his looks), and for a while, that might have been true. The female form simply wasn't something I initially was attractive to. But because its
his body, I was able to get past that. It took me a number of months to be able to move past that. Now, my partners female form is the only female one that I truly find sexually attractive.
I haven't read the entire thread, so I have no idea if you have resolved your situation or not. Hopefully, the two of you have sat down and had at least one heart-to-heart about your situation. "Not feeling attractive to your lover sucks," as my partner explained to me during one of our own heart-to-heart talks (well after I figured out what was going on in my head.

)
Maybe he's trying to figure himself out. But, its not fair that "he has forbidden you from talking to anyone." When one person transitions, everyone around them transitions also. You have the right to know what's going on in your own head and heart!
If you can get to counselling at a LGBT+ center, I say do so, even if its a hour drive. If not, then there are places online where you can talk, like here, for instance. Ask any question you need to, hopefully someone will be able to help.
Your boyfriend has
no idea how lucky he is to have you.
Ryuichi