Damn.

You never expected it to be this off-road. You were the wife of a cheater, but that man had cheated multiple times. He knew that you realized, but never cared. You certainly was hurt, but why him when you have Yosano? You told everything to Yosano, and she clearly felt sympathic for you.

If he cheated on many other girls, why can't his own wife cheat on him as well? You've been keeping your feelings for Yosano a secret, not only that, but she did too.