Am I overreacting

Walked in on my fiancé watching porn and jacking off.. clearly I was pissed and sad and balled my eyes out and hurt and all that

He’s repeatedly told me he doesn’t do any of that when I would ask.

Am I overreacting or like how would you react??

*sidenote: porn is not acceptable by me. Our sex life is A1. (Everyday- and 5times a day when he’s off)