My bf used my account to create multiple almost naked women. He said that's nothing and I'm making too much drama. AIO?

Hello, Im in a situation where I really need your advice, because to me this shit is a MAJOR gaslight. My bf (29) and I (23) have a common account with credits I got from Freepik this Christmas. However, I created this account before letting him in so its mine, even if we use it together sometimes.

Today and while browsing my past creations, I have found no less than 15 different girls, all of them in suggestive positions and very small bikinis. I OF COURSE did NOT authorized him to create this stuff with MY account.When i went ahead and confronted him for it, he started putting me on the blame, yelling and saying me that wasn't a big deal, I was being super over reacting. I wanna show him I am not overreacting, so please, tell me: who is in the blame here?? Am I overreacting?