Discovered my husband was having a very covert Emotional Affair
How did you discover this? I ask because the WH usually denies, denies, and accuses the BS of jealousy and paranoia before he takes the steps that your WH has.
Also, have you contacted the OBS IF you have proof? It's way too easy to take an affair underground, especially in the workplace, or to lay low when the BS starts asking questions.
Workplace affairs are notoriously tricky things to end. Especially if your H is her manager. That may be why he's acting like a scalded cat in moving her, dusting off the photos of you and taking you on trips.
If he promoted her and gave her the raise because of an affair, other more qualified employees may have grounds to sue the employer. Your WH might be doing damage control at work.
Make him send the NC letter, you approve it, no secret codes in it, no hints about the future, no "Dear XXXX" just her name, and you send it or watch him send it.
Usually in a work situation, a NC letter does nothing, because if they're determined to see each other, the WH just tells AP the wife made me do it and all's well, no hard feelings between them. They just continue where they left off.
But in your case, I think it might have a very good unintended effect. Because as her manager, the promotion and favoritism probably has raised a few eyebrows, Maybe set some tongues wagging.
He might actually want to send an NC letter for future CYA. In this case, combined with the actions your WH already took, the AP might start worrying that he means it.
For yourself, hold your ground, demand a written
timeline, list of all places he saw her outside of work, list of who knew, (to make him think about that) and think about placing a GPS and VAR in his car.
I know you don't want to play probation officer. It's tiring and that's not what you signed up for when you got married.
I would look at it like taking a snapshot of your husband and his activities at this time in your marriage. Like a month long snapshot. Or two months and then evaluate your findings.