come apart
US /kʌm əˈpɑːrt/
UK /kʌm əˈpɑːrt/

1.
to break into pieces
:
•
The old book started to come apart at the seams.
•
The cheap toy quickly came apart after a few uses.
2.
to become very upset or distressed
:
•
She started to come apart when she heard the bad news.
•
His composure began to come apart under the intense questioning.