In the past I would misinterpret this kind of interest by assuming it was 'me' they were interested in. Sadly, it has very little to do with the other person. It's about feeling good again. The charge you get when someone different laughs at your jokes, recognizes your insight or notices your biceps. This is what most men enjoy. Their marriages are still sacred and their loyalty unbreakable. Flirting does not in anyway change how much they love their wives.
So now when a married man flirts with me I understand that it doesn't mean that they are at all interested in me or more importantly, interested in messing up their life. They are interested in me giving them some attention. Sad and pathetic, yes. Women are likely doing the same thing but for different reasons. At least now I know. And knowing is what keeps me grounded.