If JJ had said "Clearly, this isn't working ME . We haven't had sex in 6 months. Would you like me to help you find an apartment?". I can see that as a practical application of getting/making/having the LD leaving. It still has elements of not wanting to be the bad guy unless it was agreed on in advance. You did say you told your H something like this by saying you might leave the R after the kids were out of school if the R went back to being less sexual past some point.
I just wanted to have everyone see that ownership, by inserting the word ME is important and clearly explained.
I see/feel hints of not wanting to be the bad guy pop up often on the forum to often.