She needs to drop him.... she knows what she wants to do before complaining to you... she just needs a sounding board and assurance. I wouldn't give her the assurance, and as a gem, I wouldn't want you to lie to me... so, tell her like you see it.... let her know that normal ppl wouldn't do this to themselves... be blunt!
Sometimes wee need someone who's blunt in our lives to wake us up from the horrible dream we're living...