One possible reason could be that he feels abandoned. His parents died when he was a baby and he grew up without them. He might think that if they were more careful or made different choices, they could have been there for him. For example, if they hadn't gotten involved in the fight against Voldemort in a certain way, they might have survived. Another reason could be that he has heard so many stories about them but has no real memories of them. It's hard to forgive someone you don't really know but are supposed to have a deep connection with just based on what others say.
Chapter 483, "Why Does a Pig Eat M9?!", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 627, "Definitely Not an Accident", is the clearest early answer because it turns Nina's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He looked at the sinister smile lingering in Jiang Li's eyes, then at...
Chapter 238, "The Guests Were Dumbfounded, The Audience Was Excited", is the clearest early answer because it turns Jiang Yan's situation into a concrete plot event.
Chapter 251, "It seems that going on a transformation show is really useful!", is the clearest early answer because it turns Sister Chen's situation into a concrete plot event. The chapter gives readers a real answer by opening on If Du Qinglian was somewhat angry just a moment ago, now she was...
Chapter 692, "My Ideal Type is Assistant He", is the clearest early answer because it turns Gu Shengrong's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Zhao Lang's gaze stayed fixed ahead as he gripped the steering wheel...
Chapter 274, "Post-Traumatic Stress Syndrome", is the clearest early answer because it turns Post's situation into a concrete plot event. Early on, Upon hearing this, Officer Xu became even more excited, but catching....
Chapter 618, "Abandoned Again", is the clearest early answer because it turns Seeing Su Yinwan's situation into a concrete plot event. The chapter gives readers a real answer by opening on Upon hearing this, Jiang Cheng looked at Su Yinwan in disbelief.
Chapter 541, "Life Imprisonment as the Starting Point", is the clearest early answer because it turns Pei Ye's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The production team acted quickly, replacing one damaged drone with...
Chapter 500, "Nearing Home Brings More Fear", is the clearest early answer because it turns Zhao Lang's situation into a concrete plot event. It opens with The room, white and gleaming, was filled with a faint smell of... and closes on Truth be told, it would be a lie to say he wasn't scared..
Chapter 426, "How Did Someone Fall Down?!", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event.