AITA for not believing my ex bsf is a lesbian

I (18F) used to be friends with my ex bsf (17) who at the time told me she preferred women and labeled herself as a lesbian. She distanced herself from me because she had a crush on me and I didn’t feel the same way, however she recently reached out to me and added me into a gc with one of her friends and her partner (I had no idea that was her partner at first). We chatted for a bit until we all did a quiz and then she got upset at me for getting a character that interacts with the character her partner got which was also when she told that was her partner. When I checked her partners bio, it said that their pronouns were he/him and he was a FTM transgender, but she stated to me that she was lesbian and hated men but now she changed her pronouns to he/they and says that she’s gendervoid. AITA?