Masturbated to my boyfriend’s porn video with a guy

I know that my boyfriend is bisexual and that he’s into men and women, however he told me that he did not have sex with men before. Recently when I was looking at his gallery I got curious about his hidden photos and came across two videos, one where he was rubbing his dick together with another guy and was trying to fuck him. And other one where he was giving a blow job to the other guy and I found it very hot. I don’t know what’s wrong with me.