Sorry for the situation you are in. But I'm glad that you found here, because what you're going through is a very typical cheating. Your WW is acting by the cheater's handbook, and you seem to be doing all the things you shouldn't.
I suggest you listen to the advice given here, they were once in your shoes, and we are also witnessing thousands of cases here. We pretty much know what works and what doesn't in this type of situation.
First off, yes, they were in an A(ffaire) and still are.
They most likely had sex, yes, including that morning. If they get the chance, they will continue to do so.
They are in an A and you still let them share the same place for most of the day. This is unacceptable, it has to end. Tell her to get a new job ASAP. If you won't be in a lot of trouble financially, she should quit that job immediatelly.
Now I don’t come close to buying that but I know based on what I saw the first time this thing is in an infancy stage but this visit doubled down and was by no means keeping it professional. And here comes chance #2 with her promising to stop. Apparently told him I knew and wasn’t happy and that she needed to work on her marriage. It’s been a week and I’m still in my head not trusting that it’s done. Our intimacy on the weekends has been exceptional.
You only draw conclusions based on what you know.
It has probably started much earlier and the things you are afraid to hear have probably happened a lot.
Don't believe a single word of her, believe half of what you see.
Exceptional sex is very much to be expected, it has a special name in cheaters handbook; "sex bombing".
If you think that by talking to her or the AP, they will understand and respect you, you are wrong. Before anyone else, you need to respect yourself. You should show by your actions that you cannot tolerate this disrespect towards you. That's why 180 is important. Also, by detaching yourself from her, you create a healthier thinking environment for yourself. That's not possible as long as you're exposed to sex bombing. Btw, ask her to take an STD/STI test and don't have sex with her until you get the results. Considering you should do 180, you shouldn't actually have sex when you get the results neither.
Demand full transparency, and you can also use the necessary electronic devices like GPS tracker, VAR. You don't have to ask for location sharing, since you can reach her phone, you can activates the application.
Find out who the AP is. If he is married or in a relationship inform OBS.
Not wanting to see/hear what's happening doesn't stop them from continuing to happen.
If she doesn't face the consequences of her actions, is there any reason why she shouldn't keep doing it?
See a divorce lawyer to know your legal options. If she doesn't take the necessary steps or if you come across facts that you can't stand be prepared to filo and serve her.