Hurt by my boyfriend

Tyler
So I am so hurt and feel like leaving my boyfriend. He gave me his phone to Google a address and when I clicked the back button it showed in his history that he was looking at posts from secret encounters on craigslist. I even clicked on it and sure enough I could see what posts he looked at because they were all highlighted purple. He claims that he didn't even know that there was such a thing on craigslist and when he found it he wanted to see the weird stuff that people post and that he was bored. I was hurt but let it go after he apologized. Thats not the worst part though last week we got into an argument and I told him to leave my apartment so he did. He didn't come home til 3 in the morning and ignored most of my texts that night. Yet again we made up until i went into his email and found that he sent a couple a message on craigslist with a picture of him without his shirt on. They didn't comment back til 2 days later saying he is sexy and wants his number. Didn't show that he responded back with his number but who knows he could of erased whatever else was said. He said that he never went through with cheating on me and was not his intentions. He said that he wanted to teach me a lesson for kicking him out and if I ever kick him out again then he is going to talk to others again. I am thinking that it is time to leave I feel like he was trying to cheat on me. I am so hurt and need advice from others. Thanks.