I think it is due from the logic vs emotional disconnect. Emotionally they have said it many times in their head but logically they haven't - or vice versa.
Adds fuel to the line "don't believe anything they say and only 1/2 of what they do".
M 33, W 30, SD 10, D 5, S 4
Made it through the WAW, living happily together now. And I am much wiser for it!