fall apart

to break.

• The box fell apart due to the weight of the load.

to end a relationship, corporation, etc.

• I think I'm going to quit my job. The company is falling apart.
• Tom did his utmost to stop his marriage from falling apart.
• Unfortunately, the whole thing fell apart.
• This place would fall apart without Tom.
• The deal fell apart at the last minute.

to become emotionally disturbed and unable to deal with the situation.

• Take a break, or you'll fall apart.
• I'm not falling apart.
• Don't fall apart now.
• Tom fell apart.