I just want know if this person still love his wife is just my closed friend is wife i'm talking about?

i'm concerned of my best friend she always talking her husband attitude towards on her.They been married almost 30 years now of their married. She told me that her husband is so sweet and concerned to her passed 25yrs. but as years goes by her husband character was changed. Best friend never change her attitude towards still the same ever since they married.Now she pretty sure that her husband did not have an affair with the other woman is just that he so impatient towards her.Not affectionate anymore,always criticized her doing in the house job no appreciation for anything she is doing and done at home.He is not like that when they are newly married.I really can't help my best friend because is not my place to say something to her husband doing on her.Hope anyone can help me or I would say my best friend problem to her husband.