<human>: Can you give me a shortened version of the text?

I've known my boyfriend for 4 years now & we've been dating for a year & a half. We've had our ups & downs, but we've been able to work through them together; he's my best friend. We've talked about our potential future (moving in, marriage, kids, etc.) & what kind of timeline each of us are looking for in life.

The two of us are very open with each other sexually (sharing fantasies, etc.) but I recently found that he has been looking at the personal ads on Craigslist.

A little background may be in order. We have previously discussed the idea of having a threesome, but both of us agreed to take it off of the table because we couldn't guarantee that there wouldn't be any detrimental effects to our relationship. Most of his posts that he was looking into were m4mw & w4mw (though there were some regular w4m & bi ads as well), so I'm led to believe that perhaps he isn't as over the idea as I had thought?

Normally this wouldn't be a big deal for me, but I'm a little concerned due to the recent conversations we've had. There has been a change in my libido (I used to be a lot more sexual than I have been as of late) & he thinks that I'm unsure of our relationship. Has he checked out or is he just still curious? Do I bother saying something or should I just ride this out?
<bot>: Boyfriend has been looking at personal ads on Craigslist after a threesome conversation a few months ago. We decided against it. What gives?