My boyfriend asked strangers for nudes...

 We're pretty open with our phone privacy and know each other's passwords, but I never really "check up" on him because I trust him and don't want to feel like I'm being too controlling. Not meaning to snoop, I opened up Yik Yak (a social media app where you post statuses and comment on statuses of people in your area anonymously) and was curious as to what his "top" yak was. Those are the posts with the most votes from your surrounding area. 8 weeks ago, while we were together, he asked if anyone wanted to trade nudes. In the comments he clarified he was a male and a few girls posted their snapchats. He said "you have to give to receive ;)." Since we were at his friends house I didn't want to cause a scene and address it but I addressed it one on one later that night. He said he was being stupid and didn't know what to say. He claims he didn't actually add anyone and just wanted the thrill of having the choice to. When I first saw it I tried to equate it to him watching porn since it's just naked strangers. But later on I kept thinking about it and honestly exchanging nudes is an intimate conversation, not to mention that these are people within a two mile radius of him. It hurt to know that my nudes weren't satisfying and it made me feel really insecure. A week after we first spoke about it, I mentioned it again and said that I can't help thinking about it and that maybe we should take a break/break up for him to do whatever he'd like with other people. He begged me to reconsider and claimed that he loved me and didn't want to hurt me or lose me and that he was being silly and reiterated that he didn't actually end up doing it. I do love him and it's much harder to leave than to stay. Prior to this we haven't really had any problems or arguments but he did continuously speak to his ex girlfriend while we were still together, and would lie about not speaking to her anymore. Both of these situations make it seem like he's lonely and wants something more from our relationship that I can't supply. Although he didn't actually cheat on me, I'm still struggling with this. What do you think? What would you do in my situation?