Some people I think are trying to sort out their mental illness & end up talking about it as a way of sorting it out in their own minds.

Some people are also more involved with their mental illness if they don't have a lot of other things going on in their life.

You know how some people only take about their medical problems, some only have their mental illness to talk about in the same way.

Or worst case, they may just be going through a very bad time right now & need a shoulder to cry on.....only you know if this is a very long term situation.