Guys, what would you do if your wife was obviously attracted to another guy and stares at him around you?

Like, she makes eyes at him all the time kinda thing. And I'm sure it's worse when I'm not around and she sees him. She used to even dress sexy whenever he was gonna be around. And would go out of her way to be around him, even when I tried to take responsibility for the situation, she insisted on going after she got all prettied up for him. She literally never gets dressed up like that for me, and spends a ton of time to get dolled up for him. She toned it way down after I called her out, but she still never dressed up like that for me.
Guys, what would you do if your wife was obviously attracted to another guy and stares at him around you?
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