Brief history.....
DH had a rough childhood. FIL was physically abusive, MIL left him when DH was 12 only to become very depressed and an alcoholic. DH and siblings were neglected. MIL even tried to commit suicide a couple of times, onece telling DH it was his fault, when he was 14... They looked after her and have since treated her with kid gloves.
DH now has a very good relationship with MIL, she hasn't drunk for a long time. She had a breakdown last year and has since been very depressed although seems to be on the mend and has recently gone back to work.
Last week she did something financially very irresponsible.
DH (who along with his DB have been supporting her financially) pulled her up on it, the kid gloves came off and he told her she needed to take some responsibility and that her idea was ridiculous. (she loaned a large amount of money to a friend who needed it, even though she very much needs it herself.)
She has since refused to talk to him, saying he's thrown her back into a breakdown. She is now not taking calls from anyone and DH is devastated as feels it's his fault.