There are different scenarios:
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One is where wife is unhappy with her husband even if he tries his best to keep her happy but she still keep thinking about her past or ex or whatever. She sleeps with him while thinking about someone else.
That woman in my opinion is unfaithful. -
When a happy couple have an argument or little fight and the wife starts thinking about her past and says things like “I should’ve married that person” or “I shouldn’t have gone married to you” or “I should’ve stayed unmarried”. But after they’re normal she forgets about everything.
This is in my opinion is normal. -
When a man abuses his wife and beats her up and the woman starts thinking that she made a mistake by marrying this man and should’ve gone married to her ex.
This is natural and normal.
Though thinking about past and saying that I should’ve done this or that is useless because what is done is done.