Perhaps he's dealing with some sort of trauma. For example, after the many battles he's been through, like the fight against Voldemort, he may be suffering from post - traumatic stress disorder. To cope with this, he isolates himself from others as he doesn't want to burden them or he's just too caught up in his own dark thoughts.
Chapter 634, "All Villains", is the clearest early answer because it turns Dean Yu's situation into a concrete plot event.
Chapter 813, "She Has a Child?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from In the past, he might have helped Meng WanZhi speak.
Chapter 709, "But He Really Is My Second Uncle", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The setup is The voice came from Jiang Li., but the pressure keeps building through She had just come down from the staircase when she saw the person....
Chapter 829, "How can you not even keep an eye on one person?!", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. The chapter gives readers a real answer by opening on Yu Li reached out to take Jiang Li's bag.
A practical answer is Chapter 13, because it turns the idea into a concrete scene. The chapter opens with Sensing that something was off with Jiang Yan, Jiang Yan dismissed the..., adds pressure through He probably had a good guess who it was., and ends on How could this happen..." Lin Manru.
Chapter 650, "Trouble on the Island?", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event. The chapter gives readers a real answer by opening on Pei Ye instinctively shielded everyone behind him.
Chapter 684, "It doesn't matter if it gets broken, I have the money to fix it.", is the clearest early answer because it turns Mr's situation into a concrete plot event. The setup is But Jiang Li had already evolved;
Chapter 842, "Uncle Zhao?!", is the clearest early answer because it turns Uncle Zhao's situation into a concrete plot event. A useful checkpoint is the way the scene starts with But revealing is one thing, not making the old lady and the old man...
Chapter 788, "Don’t be so fierce, I'm scared", is the clearest early answer because it turns Brother Shaojing's situation into a concrete plot event. The chapter gives readers a real answer by opening on Song Xue covered her mouth in shock. and ending on I really did not push the auntie that day;
Chapter 2 is the strongest chapter-level answer because it starts from On the top floor of the Financial Building, a gathering of dark clouds... and follows through on Jiang, Lin Manru, turned pale and quickly explained, "It's not eloping, my....