I saw my therapist this morning and basically she said if I want to continue then to continue as I am doing - wait. Do not ask any questions about OW, or about "us", and just keep trying to show him the real me and that I am not going anywhere.
Right this minute I agree with your therapist. DO NOTHING.
I am not telling you to turn into a B!t** You really need to get to a place where this all can just roll off your back like water off a duck. Detachment is for YOU. So you can gain strength and not be bothered by what he DOES.