Hi, this is so hard to answer. Everybody handles & shows their emotions differently. In my opinion, when a wife gets to the point of walking away, she's beyond emotions. She may have already gone through the frustration, sadness, anger, grief, hopelessness, & despair. She's accepted that there's nothing she can do to make her marriage what she NEEDS it to be.
In some cases, she's tried anything & everything & nothing seems to work.
In my case, when I gave my H the letter that said I was done, I went numb. No emotion. Nothing. He was a wreck. He started losing weight, couldn't eat, couldn't sleep. Couldn't hardly function. I was on auto-pilot.
But, this is one couple, one sitch, everybody is different. Take care.
M 19 years, MC for 8 months, DB'd for 8 months 4 kids; 18, 15, 14, & 10 I was never meant to be a doormat. It took me years of therapy to become assertive enough to stop his abuse.