Hook up sites/ porn

So I need some input, I recently went through my fiancé's phone and seen that he had registered to 5 different hook up sights. In his profiles he had put that he's married but looking for a fuck buddy. He had also downloaded Tinder, all of this was done in about 3 days. He didn't message anyone on any of the sites so am I overreacting by being pissed off and hurt? I have also asked (begged) him to stop watching porn over the last few years, I told him it hurts me and I don't feel good enough when he does, but also found he's started watching it everyday while I'm at work. I don't want to leave because I love him, but he does have a history of cheating either physically (once) or through text, when things get rough and we recently went though a miscarriage so things haven't been the greatest the last month since that happened. Thoughts??