I don't know how to date this boy

Ok so about six months ago I started talking to more to this boy who I'd only have called an acquaintance before. We were texting a lot, like all day every day. We have a lot in common and get on well. This boy is a FTM transgender person, pre-op but this week has been prescribed testosterone, so he is in the early stages of transitioning I guess. I knew him before he came out, so when he was living as a female. He came out last summer and I guess we started talking around January time of this year. Anyway, we started to hang out more and carried on texting and then feelings for me on his part started to develop and he told me, and I was open to seeing where it could go although not entirely sure how I felt. Fast forward a few months, we still talk every day and hang out sometimes. His feelings have gotten stronger and I do like him a lot. We have kissed quite a bit, he has given me oral sex (which was really good) and we also had sex with him wearing a prosthetic penis... The sex for the most part was awkward and he kept his top on because he didn't want to show me his chest. Before we had sex we were kissing and I was very turned on but then when we had to stop so he could put on the prosthetic and hold it in place, and then he obviously couldn't really feel what he was doing, plus it didn't feel anything like a real penis... I didn't enjoy it at all but I didn't want to hurt his feelings by asking him to stop. I've seen him in his boxers and his binder (which is like a tight vest he uses to keep his chest down) and one night recently when we were drunk he took all of his clothes off except his boxers. The thing is I do like him and I like spending time with him, and some of the sexual stuff we've done has been ok but like when I saw him nearly naked it was just like looking at a girl (because biologically he is one) and I don't find girls attractive. Im so confused about everything, sometimes I think it will all be ok and we could be happy together but then other times I miss being with a male. Im not exclusively dating this boy but I've never been interested in seeing more than one guy at once anyway, this boy says he doesn't want anyone else, only me so he's not seeing anyone either but we aren't boyfriend and girlfriend. This boy also suffers very badly from dysphoria and depression due to being trans so I really don't want to make him feel worse by essentially saying I sometimes feel unattracted to him because of his girl parts. I never thought I'd be in this situation with a trans man and I really do not know what to do.

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