WH is also upset that I won't tell him what he should do (stay or move). He keeps telling me that I am just putting it all on his shoulders so that I don't have to accept any responsibility for the decision.
I would answer him and tell very clearly that what you want is for him to stay and to have NC with OW.
My husband tried to negotiate his OW, he tried to say they had been friends since high school and have always stayed in touch and always would. Which was a not true, they had not been in touch for 20 years until their high school reunion.
I told him no way, it was me or her.
He then tried to negotiate staying in contact with her sons and I said sure he and I could go visit OW's sons when they were at their dads house. He did not like that at all, he left me and went back to her for a few days, he then moved into his own place and started going to IC because he said his head felt like it was in a blender. After about three weeks of wanting me one minute and wanting her another, he said he was done with me and I replyed that I was done too. Then when I dropped our daughter off at his place and he saw me looking good, he asked where I was going and I told him to meet someone for a drink. He got really mad, but then it must have dawned on him that he really couldn't have us both anymore than I could have him and go on a date. I have taken flack before on here for suggesting letting WH know you can date also, but it was a turning point for my husband.
I'm not sure what he and the counselor talked about, but I think that helped alot and OMG he finally got it. It did take a few weeks of texting and calling between him and OW before he was clear enough to really establish NC.
Sorry to ramble, but my point is I think it is common for waywards to try to negoitate the OW. You need to stay firm and not compromise on this or it will just destroy you.