Just like that

[HPoirot]

FWIW... if she doesn't say anything about OM. Confidently say "see you later" and look like you mean it (without a care where she's going) unless it doesn't work with your schedule. If it doesn't, politely say "that doesn't work for me. I have plans." Don't explain your plans and then go enjoy your plans.

In any case... let her know she should let you know her plans to go out a couple days in advance at least b/c you may have plans. Don't let her take your time for granted.

Please remember... I'm still learning and I make monstrous mistakes. This, though, has worked for me. W has to respect your time. Mine does now... let's me know days in advance when she's going out. Tells me where's she's going and with whom (unless I pissed her off first). Volunteers stories about her time out. She may be lying... but I work to show I don't care b/c I have other things to do (like hang with my boy).

Now, if she does say I'm meeting OM or anything about OM ever... look at Wonka's and Sandi2's posts on my thread. There's fantastic scripts there to let her know you will not tolerate her OM and you will not live in an open marriage.