Am I the only one who thinks she delusional to think that was a marriage?

She been married for 9yrs haven't lived with her husband for 3yrs. They live in different states.But yet she is angry he got into a serious relationship with a mistress so he filed for divorce. When asked why she angry she says they were working on their marriage and taking things slow. But he hasn't spend the night with her for the 3yrs they would have sex sometimes when he came to get his kids. She has never been to his house during the separation and he has bought his mistress with him sometimes pick up their kids. Im just trying to figure out why she would allow this behavior?