fall apart

lose one's emotional or mental composure; "She fell apart when her only child died"

go to pieces; "The lawn mower finally broke"; "The gears wore out"; "The old chair finally fell apart completely"

break or fall apart into fragments; "The cookies crumbled"; "The Sphinx is crumbling"

become separated into pieces or fragments; "The figurine broke"; "The freshly baked loaf fell apart"