Get this. Spouse just called. Said "You're on your own for dinner tonight. I asked Jeff, our dentist, if he wanted to go get some dinner. I'll be home later."
I said "OK. Fine...enjoy yourself."
Our dentist is currently going through a divorce. He's pretty well off. In my mind this is just some sort of angry revenge tactic, so I refused to play along. I just let her go.
She sure knows how to hurt a guy...
Great job in not "playing along." Don't jump into the pit with her, Bomb. Stay calm, but say "Thank you for letting me know that you won't be home. Please be safe, because I love you and I care about you," and let it go. Then I would either be gone when she got home (if I didn't have kids), or I would have the lights out and the house locked up tight (if I did). And either way, the next morning, when she came out for breakfast, I would say "I'm not sure if you're just trying to get a reaction out of me, or if you had a legitimate dental reason to be out with my former dentist last nite. But if you want to date other people, you picked the wrong husband. I love you and I expect monogamy in my marriage, so if you feel the need to do this -- with my old dentist or with your current boyfriend -- please pack your stuff and get out."