Not sure where to stand

[Sparkls]

So question for ya'll because I've been thinking about it a bit more than I probably should be. One of his texts mentioned that "we don't have to talk." I'm not going to read into that at all.
I'm just worried that on Friday, he's going to try and bring up R stuff. Specifically, how do I react if he tries to tell me "he's done" and it's over?

"I understand that that is how you feel and I agree that how things were has to change." ?
Or do I just say I would rather not talk about our R while he is still with OW? I know that if he comes up to me and says he wants to officially break up, it's going to be hard for me to maintain my cool breeziness unless I have something already prepared to say, ya' know? Basically, how do you balance the tough love of a Wayward spouse approach with validation?