person A: I was in despair that someone ruined everything over nothing. They continue to ruin their life and everyone's around them.
person B: That sounds terrible.  What can you do?
person A: Not much. If someone wants to destroy themselves and everything that is ever good_comma_ you just hope they stop. All you can do is put boundaries up and try not to let their crap take you down too.
person B: I definitely agree you need to set up the boundaries.  Make sure you keep that up for the sake of everyone involved.
person A: I am_comma_ don't worry! VERY hard when you have loved someone so_comma_ but I am. They are not staying here anymore. So sad when some just don't care.