<human>: Can you succinctly summarize the text in 1-3 sentences?

Obviously, a throw away. Last night I went to the history of my computer to look for something that I had been on earlier in the day, (was not looking for anything as it is MY computer.)

I was scrolling through the history and find that there is an email with a woman's name so I click it and the entire email is messages back and forth of w4w (women looking for women) ads on Craiglist. All of the emails sent and received were at times that I wasn't home. 

I am pretty positive that he made the email to message girls and get pictures, even though he's trying to tell me it's his "lesbian friend's" email that he gets on because porn does nothing for him apparently. But we have a lot of mutual friends and I have never heard of someone with this name.

I am just unsure of what to do at this point, we've been together for 6 months and I don't want to break up with him, but this is very creepy to me. Pretty much just looking for some advice.
<bot>: Found an email account open on my computer, boyfriend is  posting w4w ads on Craigslist to get pictures and talk to girls.