Am I gay? Idk what to do

Hi, throwaway account here cuz I don’t want my family to find out

I (16M) have been dating my GF (16) for about a year. My GF was a trans girl when they started dating me but they (pronouns isn’t she rn and you’ll see why in a bit) haven’t done any of the transition stuff yet like hormones, they are just doing their makeup and dressing like a girl so far, and I’m fully supportive of them. Their family is also cool with it so there’s no weird homophobic transphobic drama or anything.

Anyway so a few days ago (don’t wanna say when cuz she might see this) they told me they don’t really feel trans and he’s actually a guy. This was totally out of the blue for me and I know there’s no drama with his family so he’s not being forced to change or anything. He said hes gonna continue dressing as a girl and doing his makeup and stuff as like a fun hobby, and nothing was gonna change between us, but if he’s a guy and I’m dating him that makes him a BF and then I’m gay.

I don’t have any problems with gay people obv but I don’t wanna be gay myself yk? But I still love him and he isn’t really changing but he’s not a girl and I’m confused.

What should I do? Btw he was a trans girl before he dated me I didn’t start dating a dude