If you're not a (straight) guy, pretend that you are for a moment or make whatever mental adjustments necessary to play along.
OK- you're a guy and you're a musician with a lot of gig experience. It's late at night and you just played a show and now you're getting ready to leave with your teenaged son and girlfriend. Your girlfriend's ex-husband (let's call him Willie), played drums on this gig as well, and she needs to briefly discuss something with him about their son before she leaves. Let's note that they've been separated/divorced for 12 years but are still friends. You know that they will never get back together, no question about that.
As you and your son stand a few feet away and wait, she steps into the doorway of the small dressing room behind the stage. There are only a couple of people around and they are roadies who are busy clearing the stage and moving equipment, not really paying attention to anything to anything but what they're doing. As they talk, Willie (who has just finished playing) takes off his sweaty shirt to put on a dry one. He's developed a nice little pot belly over the years, unlike you, who are the epitome of fitness and well-developed musculature. After they talk, they hug goodbye and Willie kisses your girl on the neck. As you leave, your girlfriend mentions this and laughs about it, because she (and everyone else) knows that Willie is a flirt and this is just how he is. (Maybe a kiss on the cheek would have been the norm?) Your girl has recounted on many occasions that Willie frequently hits on her in a less-than-serious way, as he knows it's futile but gets some kind of kick out of seeing her get mildly aggravated by it. (Maybe in the back of his mind he thinks that one day she'll surprise him and say OK, but she's already told him it ain't happening and for the most part, he accepts it. In any case, you know how she feels.) Anyway, she's laughing it off this time, as the three of you proceed to the car.
Now, tell me what is happening in your mind, playing the role of the guy. How do you feel? What are you thinking? I don't care if you want to be silly in this role playing game, as long as you follow it with, seriously... Once you respond, (please humor me, all of you!), I'll explain. Thanks bunches!