..I don't even know where to start...

My husband and I have been going threw things and are trying to patch things backup. He is taking a nap right now. We have passwords on our phones but neither of knows each other passwords,..(iknow his but he doesn't know)...I just had a feeling telling me to look threw his phone real quick. He has a Porn ADDICTION!! And that's one of our problems, I look at his Internet History and Mainly there is porn websites but the I see.....shake me damn head......There's a dating app that we met off of, 3 years ago, we both were on and off it looking for A Unicorn(Poly Relationship). We had a couple chance that was close but never really succeeded. So we stopped for a while.
But lately, My episodes have been really been HARD on the BOTH of us! I did couples things and he did couples things that I will explain later that has landed us at the last straw....
Anyways...we both agreed to delete the app and not go back on it....When I checked his Internet History couples minutes ago, I seen that he was on it still....And I'm Just...FURIOUS, SURPRISE, SHAMED, DISRESPECTED, I feel so stupid......but yet OUT OF WORDS.......I'm staring at him with such hurt while sitting here shaking making my tics react, eyes full of years but won't dare to drop because of him...
I haven't gone into the app to see what he has been doing or saying, but I definitely do have a feeling and I just don't know what to do AT THIS MOMENT and just feel stuck...
Can someone please give me Advice, Suggestions, some kind of Information that can HELP me UNDERSTAND or COPE of how I feel and WHAT TO DO!?!?