Should I tell my partner I think I might be trans?

I have a friend/romantic partner that I've known for half my life at this point. It's a long distance thing at the moment, and we aren't "official" because I'm not even out about my sexual orientation yet. I'm not really sure what our relationship is at this point and it makes me feel guilty, like I'm being weird and noncommittal, but that is a whole other conversation that I need to have with them.

They told me that they are non-binary around two years ago now, and that is what really kick started the uncertainty surrounding my own gender identity. This past summer I worked up the courage to tell them that I think I might be NB too, but I never outright said that I am because I honestly don't know. I just told them that I might be and we had a brief conversation about it, but that was it. I haven't talked about it with them since.

Lately the idea that I could be transfemme or a trans woman has been on my mind a lot. I'm not sure of anything yet. The problem is that my partner is not really into women as far as I know. Part of me hopes it wouldn't change anything, but I realize it's wrong to expect them to make an exception to their sexual orientation. I can't get over this feeling that I'm lying to them or leading them on or something. I don't want our relationship to become more serious only to blindside them with this months or years down the line if/when I ever figure this out. I feel like they kind of deserve to know if we're going to continue our relationship, but I'm terrified it could mean the end of things for us. I don't want to throw away the only relationship, and the closest friendship I've ever had with anyone just because I think I might be trans.

I'm not sure I'm ready to tell them anyways as I'd like to be more certain myself before telling anyone else. That being said they're the only person I'm willing to talk about my gender identity with and I'm getting sick of going through all this alone. I guess the best case scenario is that I tell them and eventually realize I'm trans and it changes nothing. On the other hand the worst case scenario is me telling them and ruining things between us only for me to realize I'm just some confused cis man. I don't really know what to do. Would it be wrong for me to keep this a secret?

 

I feel like I told them that when I said I might be NB, I just didn't mention the trans woman part. It's already a sexual relationship, so I feel like it might be awkward going back to being just friends. I know it doesn't have to end, I'm just worried.