1) He's going on a trip with her and her KIDS after just 12 weeks? Lol! Other people's kids are usually annoying under the best of circumstances - going on a trip with them (and remember, they will likely see your H as an unwanted intruder) should be interesting! I suggest you rent the movie She-Devil with Roseanne Barr.
2) Working with your H is an awful position to be in, but it also gives you some unique possibilities, if you use them. For one, OW WILL be jealous and annoyed that he's spending all day with you. Two, you can take the opportunity to look SMASHING at the office every day (and wear some seductive new perfume). Three, you can do a little mental jujitsu on your H by letting him think you are going out and having a grand old time (funny how it never dawns on them that you MIGHT not be sitting around waiting for them). Have a dozen roses sent to you at the office with a note that says "Thanks for last night". Bring dress-up clothes to the office and change at the3 end of the day as if you are going out to dinner on a date afterwards (but if he asks, you're just going out with a "friend. No, no one you know"
Even if you have to get all dressed up and then just go sit in a Starbucks or book store, let him imagine you might be out dancing or some such.
Be particularly happy in the office the next morning. Whistle to yourself. Pretend to be getting funny texts on your phone.
