Yeah it's absolutely an incel meme but do no means do I think that they invented it or that it's unique to them. I think almost all men have this feeling to some extent, I think it's a rare guy who is happy to know that every good looking guy in his office slept with his girlfriend casually. Proximity (time, location, social circle) is definitely an aggravating factor but it's all just a sliding scale. I like to think that I mostly don't care about a girl's past but it's definitely annoying on some level of the sliding scale.