Taken signs that act like singles...

There is literally nothing that brothers me more than people who are in relationships and act like they are singles! As a scorpio female, it's inconceivable to me. Lately, i was substituting for a day and a half and i met the most charming, elegant (in moves, style, gestures) and gracely flirtatious man. As per usual my pisces rising didn't help but fall a bit (or a lot) for him. I didn't even know his name and i wouldn't substitute again there, so there was no chance i meeting him again. As a scorpio though, i couldn't forget and i put my detective skills in action to find him online. Unfortunately in one social his wall was with his wife and his status was married... I guess i was "lucky" not having to see him again. Yes, his flirt wasn't explicit (to someone watching us) and obviously didn't cross any line, but still he was definitely attracted to me and flirted with me straight away. Why give hopes and maybe create feelings to someone else while you appear to be happily committed and maybe never betray carnally but still engage in this emotional activity with someone (or many) else? To boost your ego only? The worse is that many times at work I've seen two commited people (with other partners), explicitly flirt with each other in front of everyone, even massaging each other in front of us! Disgusting people and behaviour! I'll never, never understand.

A few days ago i read in the astrology site that i visit an article on the signs that will hurt you without a care in the world, just to boost their ego. They were aries, leo, libra. He was a leo with libra placements also... A relative of mine was a leo man and he had an army of admirers who he made fun of, when they weren't present. From your experience, which signs acted like this?