<human>: Okay, here goes. Some background:

FIRST: We've been together for 4 years. He has, in the past, flirted with someone long-distance over text messages. I wouldn't have found if I hadn't used his computer and seen the texts in his Messages app (this was me being nosy, which I realize is shitty but if I hadn't done this I wouldn't have found out). I counted this as emotional cheating, he swore it'd never happen again and he blocked the number of the person as soon as I confronted him. Claims he was just doing it to make this guy feel better. That was a year ago.

SECOND: The day before yesterday I asked permission to use his laptop for Netflix because mine crashed, he said yes (he was at work, his laptop is always at home). 

After using the computer a bit, I looked at his browser history. I know this is terrible-- I have never done it before, and feel extremely shitty and guilty about it. But because of point #1, and how he has been acting lately, I have been insecure about where we are right now in our relationship.

In his browser history I found M4M Craiglist ads (which are all down now), and searches for our neighborhood on days that he knew I would be out until late.

So, should I confront him about this? 

He's never physically cheat on me, as far as I know... our sex life is really good. I have a feeling he may be just getting off the to idea of the hookups that are happening-- he also likes to read erotic fiction. I doubt he is posting them himself, but I am not sure. He is home when I get home, he's usually still awake, he showers me with affection all the time. He doesn't have time to cheat on me, as far as I know.

Can you provide a brief overview of the text?
<bot>: I violated my partner's trust, found Craigslist m4m ads in his browsing history. Not sure if I need to confront him about it or not because I shouldn't have even been snooping in the first place.