IMHO instances like the one described in the original post are some of the instances SI can offer the least help…
This is an infidelity site. The common denominator with all that contribute in JFO is that we have all experienced infidelity, and I warrant that for probably all of us the discovery was unexpected and traumatic.
I think one consequence of our experience is that we tend to see infidelity in EVERYTHING.
Yes – your wife might be somewhere on the slippery slope of entering infidelity-territory, but there can be other reasons for her not wanting you at the office party. Basically, the reasons can range from wanting a romp with Clive (the office manager) in the supplies room to maybe wanting to go pub-crawling with the girls after the party, or maybe no other spouse is attending, or maybe the spouses of Jane and Susan – her best office friends – won’t attend. Jumping to the “she’s definitely having an affair” conclusion isn’t correct right now.
The gut? NEVER trust it, but definitely listen to it. Answer its questions but trust your BRAIN. Trust what you can find, see, read and evaluate. If you were controlled by the gut… then any man that talked to her is a possible OM, and any man that ignores her is ALSO a possible OM… Is there really any way to win with that sort of logic?
Since I mentioned logic: Generally, what makes office affairs so “exciting” is the same thing that makes all affairs “exciting”: Secrecy. IF your wife and Clive have the hots for each other then it’s very likely that they are keeping it hidden from their co-workers. They think nobody has noticed how they sit together at lunch, how they flirt or how they are both out of the office “with clients” at the same time. It’s highly unlikely that she will drape herself over him at the party. It will be secret glances, chance meetings and all acting as if nobody knows… when the office gossip has already grasped what’s going on…
My suggestion?
Well… IF it’s an ongoing affair then that party won’t make much difference.
Insist on going, but don’t go as an @sshole. Don’t go there looking for OM because IF there is no infidelity you want to show her coworkers her wonderful husband. Even if there is an affair then being amicable at the party might even get you info and hints from her colleagues.
If you are the typical been-married-for-20-years couple, then I’m guessing you two don’t have much of a party-life. You might have dinner with the in-laws and meet friends and all that, but parties where you go out, to bars or dancing and stuff like that… Probably not.
IF your wife starts talking about maybe you not coming along… you reply with how you want to better understand her work, the people she’s meeting there, how you want to be part of her life and how you two need to remember to have a good time together. How you two need to take care to grow together rather than grow apart. If she’s adamant, then definitely tell her how you fear you two will grow apart and that you fear it might destroy your marriage.
Heck… if there is a commute to the office or venue consider packing an overnight bag and inviting your wife to a romantic night at a good hotel. Instead of this being about the office party and if or if not, you should go then make it about your marriage and have your wife explain why THAT isn’t welcome to her office-party.
IF she’s having an affair then it will come out with time. IF you are still convinced there is something going on after the party then definitely keep your eyes open. Affairs need communications and since they are keeping it secret at work then that conversation won’t all be over the water-cooler in the hall. IF you still think something is going on 100% be vigilant. Phone-records, secrecy, unexplained overtime, frequent visits “with the girls to play bridge” … But don’t search for infidelity… Search for what is wrong. It MIGHT be infidelity, it might be something completely different.