Thank you so so much for all of your replies, it's giving me a lot of insight on the situation. I appreciate everybody very very much.
I will get more into details with the dating site. As I said in my first post, there are other things that have happened that I haven't written about.
It began before I even found the pictures. I had gone on his phone months before in the winter to check something and saw that he had a dating app and kik. I demanded an answer. He told me some bullshit and I brushed it off. Over the past 4 years I've caught him flirting with 2 different girls on his phone but he never met up. They would ask to hangout and he never would. The one time he's ever cried was the second time I caught him talking to a girl and he said his friends give him shit for being in a relationship when they go out and that he has low self esteem and that he doesn't deserve me.
So basically the trust has been broken before. But after the last time when I initially found the app but no pictures, I stopped going on his phone because I realized it is an invasion of privacy.
I found these pictures by myself, in my room on MY phone. I downloaded the app because my gut must have told me too. At first I thought I didn't see anything but THEN.... That butt looks familiar, so does that room, so do those clothes.... They were uploaded 20 hours before I found them. This app tells you when somebody views you and although I used a fake name I think he knew something was wrong when a weird name KEPT viewing his profile.
The thing is, I never thought he was gay. He was the one who defended it before I even accused, saying I think he's gay or something. I never got that vibe from him he's always been very into me, but maybe some of you can fill me in on whether or not you were intimate and very into a female before you realized you liked men too? Or maybe when some of you were this age, you were confused of what the dressing could mean?

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For the record, I am very much not okay with being with a bisexual man. No offense to anybody, it's just past my comfort level. I'm also definitely not okay with an open relationship.