My partner is questioning being trans, do I break up with them?

I (F22) have been happily dating my partner (F19) for about 2 months. My partner came out as potentially being trans. I'm bisexual however have a strong preference for women and don't see myself dating a man.

I know the relationship is young but I don't want to let it go. Neither does my partner and npw they seem to have built a narrative now that they were happy being a woman, until a few people mentioned that they looked boyish or compared them to men. Apparently they are content being a woman and wish to explore it more.

But if I broke up with them, they would have likely explored being a man in their time or if I simply accepted at first, they'd have happily become a man.

Should I just break up with them? I don't want to force them to be something they're not.

Extra context: They were trans about a year ago and detransitioned as they didn't fit in socially and it was too much.
My partner is questioning being trans, do I break up with them?
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