A while back, I went for drinks with a friend and her boyfriend.
At a certain point in the night, a buddy of my friend's boyfriend joined us and the two of us flirted a bit.
I thought he was cute, but it turned out he had a girlfriend, and I am not one to flirt with a guy who's already taken, so I seem to remember avoiding him for the rest of th evening.
This weekend, my friend randomly mentioned that this guy was single again. That he had his girlfriend had broken up.
While a few years ago my thought might have been "Oooh! We flirted, he liked me, we should get together," my thought now is "I wouldn't want to date a guy who was happy to flirt with another girl when he was in a relationship."
I'm sure there will be some who tell me this is an over-reaction, but I want to trust the next guy I'm with, and having already seen this guy "in action" so to speak, I wouldn't have a great deal of trust in him from the start.
And that's no way to start anything.