My sense is that OW feels a difference as well. She seems to have tightened the rope but H is still managing to get round it by visiting when he is supposed to be working. The give away is his work clothes which he changes when he gets home but puts back on before he goes back to OW.
Be careful you don't become the "OW" to the OW, if that makes sense. He's SNEAKING behind OW's back, it looks like.
Apparently, when he got what he wanted, it WASN'T what he wanted, and so he's coming back toward you.
You will know when it's time to make him choose between you and OW..otherwise, this could go on for YEARS..and you don't want that to happen, LA.
Cake Eating is not something anyone wants to get involved in, and it shows weakness on the MLC'er's part....people who do it have to be shown it is NOT acceptable to have one foot in each door or sit on the fence.
Watch the situation carefully, and I hope he dumps OW on his own without help from you...it is better if he DOES do it on his own.
OW, as it stands is HIS problem, not yours, yet, you know this as well.
I cannot advise on how much time is needed before the stand is made..only you would know that, as you know your husband better than anyone, and are observing the situation first hand.
Good luck and keep us posted.
Remember, as each person is different, every MLC/Transition is different..what works for one may not work for another. Most of the time it is trial and error for ALL involved.