Don't put too much hope into those tiny "warm ups", Job described it so well, I will add also, since you have been distancing/detaching yourself so well lately this could be just a tentative to be nice just to see how you can react to some positive attention from his part, another weird way to his influence/power on you, and since it didn't work, it left him "puzzled". Your actual way to relate to him is so different from what it used to be, you are not playing into his PA game anymore and you are not trying to "seduce" him either. He must me wondering what's going on with you. You became "indifferent" (detach) to him, you are not flattering his ego or neither pursuing him.
Also keep in mind, an affair is based on fantasy (la la land) so the the longer it's going on, the least it's possible to sustain it without having to face some reality at one point, usually the OW plays it very "cool, loving, not demanding at the beginning" then she starts to make demands.
Demands mean you HAVE to make a CHOICE based on reality, until now the choices made were "justified" in a very twisted manner based on the behavior/reactions of the LBS but when you are not "reacting" anymore, choice is left to them only without anybody to blame, it's much more difficult... So the least "demanding or reactive you are" AKA being detached, it starts to show off as a positive side in regard of the nagging OW. You become the "easy going" and she is now the "annoying".
I know it's kind of a long twisted explanation, but MLC is a twisted journey.
Me 52+ WH 57+ Married 20 + Piecing since 2016 (ready to give up...)