Nà cì chǎojià yǐhòu, tāliǎ zhījiān jiù zhùchéngbì le.
After that argument, a wall went up between the two of them.
Tips
memory
Literally 'to build a city wall' - the image is clear: once the wall goes up, you don't come and go freely anymore. Used for emotional distance, not physical construction.
