Sarezuma no Koubutsu wa Musuko no Doukyuusei

I am living with the realization that my husband is cheating on me.
She pretends to be unaware of her husband’s affair, thinking of her children, but
I was getting close to my mental limit.
She looked at other men with the intention of having an affair herself, but her heart was not fluttering at all.
She was in despair over the fact that no matter what she looked at or what she did, her heart was not fluttering.
Then, a friend of her son’s comes to visit her and …….