Every relationship has differences. Without fights and arguments, you can't strengthen your bond. Every argument is a test to see how far you can go to keep this relationship.
Jie knew this very well. But he'd rather not have those arguments or fights with Xu Mey. However, he was still okay with these arguments. At least, it meant he still had something to fight for.
But when he recalled Xu Mey's words from this morning, he felt distressed and heartbroken all over again. And yet he chose to blame himself wondering maybe he had really done something wrong. Maybe he missed something and messed up. Maybe he overreacted. He really had no problem in lowering his head but Xu Mey really hurt him all over again. She really made him question himself and it made him feel even worse.
Nonetheless, it was not enough to make him give up on them.