While OP states they are generally supportive of gender identity expression, this change presents a personal dilemma concerning their own sexual orientation. OP is confused about how this shift in their partner’s gender identity affects their own identity as a straight man, leading to the central question of whether they are now considered gay or bisexual. The immediate aftermath involves OP grappling with this internal conflict and questioning the validity of their feelings despite their liberal views.

I’m very liberal actually but I don’t know about this one. She doesn’t even present a tad bit as masculine, just told me she is now a male and I should accept her new pronouns he/him and gender.
Which is fine I guess because who am I to tell them they need to present a certain way to be deemed worthy of their gender – but does that really make me gay/bi now? I’m a dude and I support her and all but this doesn’t seem right.
Conclusion
OP is currently caught between their established support for progressive views on gender and the personal reality of navigating a relationship where their partner’s gender has shifted. The conflict is rooted in the tension between accepting another person’s identity and questioning how that acceptance redefines one’s own self-perception and sexual orientation.
The core issue for debate is where the boundary lies between supporting a partner’s gender affirmation and the impact it has on the sexual orientation of the non-transitioning partner. Is OP obligated to redefine their orientation to maintain the relationship, or does maintaining their orientation mean accepting that the relationship dynamic has fundamentally changed?
Here’s how people reacted:
I’m a straight male.
I use “they/them”, I stopped saying, or at least am trying to stop saying “yes ma’am” or “damnit woman” or any of the other things that were pretty casual prior, I use “partner” instead of “girlfriend”, and I accept that everything they say about their gender identity is true.
I remain a straight male.
I don’t care about the sounds. I’ll make whatever noises I have to make. I don’t, really, care about gender identity. I don’t care what anybody identifies as. My attraction to minds and personalities is separate from my attraction to bodies. My partner has a female body and that works for me. If they have a neutral or “masc-leaning” mind, I mean, I’m kind of indifferent. I’m not opposed, but it’s not super important to me as long as they remain decent and kind. My orientation hasn’t changed, just the sounds I make with my food hole.
If your partner now identifies as a man and uses he/him pronouns, while you also identify as a man and use he/him pronouns then online you would be seen as gay/bi/pan/queer.
If your partner starts presenting in a masculine way or appearing to the general public as male, then they will assume you are gay/bi/pan/queer.
None of this actually changes the fact that you are straight and only attracted to women. But you need to understand that you will be perceived as something other than straight.
And to your edit, you may currently want to stay with your partner but I think you both need to do some long term thinking on this. Just because at this moment he doesn’t want to present as male doesn’t mean that he won’t in the future.
If you do want to stay in this relationship, then you will need to come to terms with what that means for your identity. If you’re comfortable identifying as blanket-term queer, and don’t want anything to change with regards to dating this person, respecting their gender identity means acknowledging that you maybe aren’t straight. I assume he wouldn’t want you calling him your girlfriend anymore.
It’s okay to be straight. It’s okay to end a relationship because your partner is transitioning to a gender that you don’t want to be in a romantic relationship in. It’s all okay.
You really need to talk to him about this, not reddit.
How old are y’all? Wait, aren’t young people supposed to see sexual preferences as a full spectrum? Liking masculine or feminine body types doesn’t inform what “gender” you’re attracted to. You’re attracted to their physical features, not their pronouns lol.
You are supposed to say “Yes, of course honey, I would scoop you up and put you in a water bottle and carry you around with me.”
His gender identity and your sexual orientation are two very different things.
If you are not comfortable dating a man you should probably break things off.
You are with a female.
is there even a line anymore?