I think strictly empathy is the answer for a while, show support and don't try to solve their problems. But what do you do when that becomes all that person wants from you?

I have a friend who has been in a rough spot for a decade all they want to do is vent to me, they don't want to solve any of their problems and there is no "give and take" in our relationship. All there is now is them complaining about their life to me and I either respond with empathy and support or "I'm not being a good friend".

If I suggest a solution, they don't want advice If I suggest a resource for them, there's nothing wrong with them, they don't need a _______ (fill in the blank with doctor, therapist, etc) If I put up a boundary to separate myself, "fine, I just won't confide in you any more"

What do you do when you get to the point where you're sick of seeing your friend struggle or it is no longer healthy for you to just be their venting person?