my boyfriend watching porn suddenly bothers me

please read my whole post before commenting! basically, last night i was sitting with my boyfriend and he had reddit open to show me something and i saw that he had two porn subreddits in the search history. similar things have happened before (ie the reddit search thing, and finding a login to a porn website he has saved in his notes app) and it hasn’t bothered me as much. im thinking this time did because i recently went off my antidepressants and suddenly went from feeling numb about everything to feeling overly emotional. after i saw this i didn’t say anything and took a shower. while i was in there i felt awful, like i would throw up, borderline hyperventilating, but not yet crying. i know this is dramatic based on what actually happened but its what i felt. after my shower i talked to him and of course then immediately broke down in tears. i basically told him that seeing that for some reason made me feel dirty, and a weird sense of doom. i told him just so i wouldn’t keep those thoughts inside my head. i don’t know what to do, because my boyfriend is a really sweet guy and i don’t think it’s right for me to want to control his sexuality or the way he gets off. i’ve gained 20+ lbs since starting to date him, and im sure that’s part of what made me feel so awful - my insecurity. but i know he still finds me attractive and i don’t question that. he suggested he could just read erotic stories to get off which he sometimes does anyway, but again, i don’t want to be “controlling” the ways he can and can’t get off. i think it especially feels weird because i don’t really watch porn, and he jerks off every day, usually using porn. it also almost feels worse somehow that it’s “amateur” porn being posted by regular people on reddit, he’s not watching pornhub. idk why this seems more hurtful lol. im not sure what i want from this post, i just wanted to get my thoughts out i guess. no TLDR sorry!