Why do guys with serious girlfriends try to hook up with other women?

adamjanovic
I'm pretty sure I know the answer to this, but I'd just like to hear other people's opinions on why men who are in committed relationships, love their wife or girlfriend and have no intention of leaving them go and seek out other women to have sex with. I'm wondering because there have been several occasions where guys who have serious girlfriends have hit on me (and by hitting on me I don't mean harmless flirting but crossing the line and getting inappropriate and even trying to get me in bed).

For example, several years ago this guy at a party I was at got fixated on me even before we talked to each other, got me alone and physically tried to have sex with me but I told him no. He had a girlfriend who he said he wasn't leaving but really wanted to have sex with me. Last year I was on a flight to California where I was taking a course and I was sitting next to this guy who had a girlfriend, and we had a nice conversation, but I could tell he was attracted to me, even though I had mentioned several times that I was married. Towards the end of the flight he suggested that we get together and do something in LA (just the two of us). I knew what was on his mind and so I said no. On the flight home I actually sat next to someone famous (I won't say who, I don't wanna get sued!) who was filming something in Vancouver where I live and he asked for my number "in case I got tired of my husband and wanted to have some fun!" 😳 I said no, of course! There are more examples of guys wanting to cheat on their girlfriends who they supposedly love with me. What's up with this?
Updates:
+1 y
I'd like to rephrase the title as why do SOME guys with serious girlfriends try to hook up with other women, as I know that not all guys do this.
Why do guys with serious girlfriends try to hook up with other women?
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