Boyfriend hiding comments on facebook?

My boyfriend stopped having "intimate relations" for over a week because he wanted to. I see that during this period he posted two comments on facebook "up" and "stimulation". I cannot remember how I found these posts, but I think it was wall-to-wall. These posts do not exist elsewhere. I was suspicious because he received a Mail daemon for craigslist. He first said he didn't know what it was, but it is basically an advertising site, but on that site there is advertising for personals. I told him calmly this morning about my concerns, and I won't be angry if he tells me he cheated - I just want to know the truth so that I can move on. The relationship has been rocky, and both of us have threatened to leave. I notice the dynamic is that i will leave and decide I want to chase him, whereas when he threatens to end it, he seems so definite. I told him he can see other women, just tell me. He says no, I am just paranoid. He could have been selling things on craiglist afterall, but then why say he does not know what it is? He wouldn't have received mail daemon if it was just junk mail right? He says he loves me and he is prepared to work through problems with me together. I just want to protect myself.