I have a friend of 20+ years I'm debating cutting off because she is making such a mess of her life--dating a felon, among other things. (I am definitely not the friend of the OP, not going to grad school again, LOL)
She has complained that several of her local friends have cut her off, and it's ok, because "they weren't supportive of her choices." She wants everyone to be supportive of her, but does not want to be supportive of them.
I'm trying to be there for her, but if she says one more crappy thing about my "gluten free diet" that's allowed me to lose 50 pounds, it may be the end. Seriously. While I'm supposed to listen to the huge wrecked up drama she's created out of her life?
Maybe this could be a part of it, OP?
Maybe it was the last straw for your friend?