Bad Pics on phone

So tonight, I just had a feeling. I can’t explain it. Something told me to go on my boyfriends phone. I NEVER do this and never ever have a desire to but tonight I did. And I was not prepared for what I found. He recently had been out of town for work. Three weeks out of the four in February. During those 3 weeks he had screenshot so many women and porn images. Some of the ones of women im not sure were even celebrities or different girls sending them. In addition, I found screen shots of another man’s nudes that my boyfriend had in his recently deleted photos. What in the hell. I feel like my world is crashing down. I feel like my boyfriend is bisexual. I feel like I can’t even handle that thought. I feel like he is a sex addict. There were sooo many images. Does this make him a cheater? Def a liar. I don’t know what to do at this point. How do I even get through the night or tomorrow...? What would you do in this situation?!! Please help: I’m just laying in bed balling by eyes out.