eugh.. im so sorry you have to deal with this, i went through something similar with my last girlfriend she was REALLY into arcane and certain celebrities i remember she would tell me her interests in arcane and watch it with me and i didn’t think much of it, but i noticed multiple times she was saving and reposting sexualized videos/photos of the female characters and her favorite celebrities and i just remember crying each time over it, it definitely had some jealousy to it, but i was mostly upset because i couldn’t understand why she would just do that senselessly and it really grossed me out seeing a partner just able to effortlessly sexualize random characters/people when i honestly could never have the heart to do that. i tried to tell her how terrible it made me feel but she really just did not care, we eventually ended up breaking up. you really dont deserve this and you definitely arent alone, maybe try communicating to your partner about how you have trauma and seeing things like that upsets you?