Is my boyfriend right? Am I gay if lesbian porn turns me on?

19F here

not interested in girls romantically, only guys. never wanted to kiss a girl, never attracted to one in real life. but I do watch lesbian porn and get off to it. not sure what it is about it but I like it better than straight porn. I told my boyfriend tonight after we got in a bit of a debate about a straight friend of mine who watches lesbian porn and after he said she must be lesbian or bi ended up telling him that I do too and now I just feel horribly weird. we've been together 4 years, I love him to pieces and the sex as well but now I just feel totally horrible and like now he thinks I'm lesbian or bi or something and that that'll always be in the corner of his mind. he said he just can't understand how someone straight would get at all aroused by gay porn and that he's checked himself and wasn't aroused in the slightest so now I feel like a freak. he's very very sweet and a great boyfriend so I'm not sure why I'm so upset about this. he told me to stop overthinking but now I just feel horrible knowing my own BOYFRIEND probably questioned my sexuality after 4 years of being with me.I just have a horrible feeling now. I'm in tears..

any advice appreciated