I'm confused as to what you mean...but maybe the person feels like they are not being heard? Or maybe they feel like no one cares or is listening so they feel bad for themselves and repeat their issues over and over?
There are some medications that cause people to repeat themselves because they have forgotten they've already said it. Also, when depressed, a person may have one particular thing on their mind and it keeps being expressed verbally. I had a teacher's aide who repeated herself all day every day for years. It was her medication. If they are not on medication, then they are trying to tell you something and they don't feel they're being truly heard in the way that they need help.