<human>: I'll open this up with a confession. I'm a fairly insecure guy when it comes to relationships. I'm a confident person in almost all walks of life, but one too many manipulative and hurtful relationships (romantic and otherwise) have left me thoroughly defensive. And, as of last night, invasive. 

Against my better judgement, I found myself looking through my GF's recent texts last night. She was asleep, and an unfamiliar male name buzzed her phone. To be clear, the guy that texted last night turned out to just be a friend. But, I let morbid curiosity get the better of me, and was looking through some prior conversations.

I found one, dated recently enough to be in the unquestionably-exclusive period of our relationship. A former partner of hers had texted a "suggestion," that, they should "find themselves in a puddle of sweat" and whatnot. Details unnecessary but damning. In her defense, she opened with, "I have a boyfriend now, and I'm kinda into him."

But, she immediately followed with, "But, I'm curious. What do you have in mind?" And he proceeds to describe a fantasy encounter that got particularly gory.

Look, I get that people have needs, physical, emotional, and attention-wise. But I consider myself a very attentive boyfriend, and my SO is always ostensibly happy with our relationship. In fact, if memory serves, the texting-day in question was a great one for us. 

For me, the idea of entertaining sexual advances from anyone is repulsive. I get a reasonable amount, and always shut them down quickly without any sort of positive feedback. Doing so would feel dirty, or unfaithful.  Even if fluids are never swapped, the spirit is the same to me. Scaled down, of course.

I suppose my

Can you give me the gist of the text in a nutshell?
<bot>: is this: Is it normal for adult relationships to have flirty, if unrealized, advances on the side? If so, I really need to reevaluate how I define "exclusivity" in a relationship.