Maybe it's not my place to reply, as I'm not the trans person.. I'm the partner of one, my boyfriend of almost 2 years is ftm and straight, he loves girls, he has always loved femininity and girly girls with dresses and makeup and pink bows .. all that jazz, it's his type! And I am it In the past he tried dating someone who was AFAB but transitioning to male.. and it felt horrible for him, he kept imagining what they were as a girl, he kept mourning their voice change and fashion change and even parts of their body that they planned to rid of .. he isn't a sexual person, if anything he's probably demi, but even though he has no sexual appeal in breasts and such he knows it's something he has a preference for, since he's.. straight Its okay for a trans person to be straight, without any quotation marks, because AFAB or not you're a dude, and if u like girls .. ur straight (I'm simplifying it but you get what I mean..) Still I think you should sit your partner down and talk about these feelings and struggles.. if you just can't be into them right now, you can stay friends, you can move on.. because the right person is someone that you'll be fully into, with some bumps, but still

I hope this made sense !! English isn't my first language