Nothing is going on with OW, emotional or otherwise. Our torrid A has consisted of a few conversations in public venues. There's obvious attraction and chemistry, but nothing else. I've made a point of not swinging by her cubicle to talk, keeping things to a quick "Hi" in the halls. I was up front about being married. I actually feel a little silly at how much of an effect she had on me.
I didn't mean to imply you were having an A with her, but by your own description it could be an A waiting to happen. Whenever there is "obvious attraction and chemistry" you should continue to avoid having any more conversations......period. The fact she had such an effect on you is a warning of how vulnerable you can be to acting on it further.
I believe most WAS thinks it is so much easier to have a new relationship than putting in the hard work to restore the old one.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!