One possible reason could be some sort of external threat. Maybe there's a dark force that wants to use his mate against him, so to protect her, he's forced to reject her. For example, if there are dark wizards who plan to capture his mate and use her as a bait to get to Harry, he might think rejecting her would keep her out of danger.
It could be due to a prophecy. In the wizarding world, prophecies often play a big role. If there's a prophecy that says being with his mate would lead to some great disaster, like the destruction of the wizarding community or something, Harry might feel compelled to reject her to prevent this from happening.
Another reason could be related to some internal conflict within Harry. He might have some self - doubts or fears about himself. For instance, if he thinks he's not good enough for his mate because of his own past actions or his 'chosen one' status which has brought a lot of chaos and danger, he could be forced to reject her out of a sense of unworthiness.
Chapter 182, "Red Wood, Eye of Truth, Three Joys Arrive at the Door", is the clearest early answer because the hidden truth stops feeling like mere subtext. It opens with On the snowy ground, a black-clad figure slowly walked towards the... and closes on All three broadswords hit Xia Hong accurately; Meng Yuan aimed for....
Chapter 255, "Frenzied Fortune-Making, Dangerous Thoughts, Perfect Timing", is the clearest early answer because it turns Red Sun Fruits's situation into a concrete plot event. The chapter turns that into something concrete by moving from 60 drops of Cold Apple Jade Dew, 180 stalks of White Frost Grass, 180... to Just this volume, the weight of a piece of silverware must far exceed....
Chapter 257, "Building a Straight Road, the Beast Meat Issue", is the clearest early answer because it turns Mirror Valley's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The dividing line of a day in the Ice Abyss is determined by dawn. and follows through with If they breakthrough to the Earth-digging Realm, they can even....
Chapter 185, "New Residence, Land, Arrow Bamboo Forest", is the clearest early answer because the buildup finally cashes out in a real clash. It opens with Hearing Xia Chuan's words, everyone immediately stopped talking. and closes on Xia Chuan laughed lightly at this, seeing the eager looks on....
Chapter 232, "Saving Lives, Acting, Xia City in Uproar [8,000-Word Chapter, More to Come]", is the clearest early answer because it pushes Li Xuantiang into a new phase or setting. The chapter gives readers a real answer by opening on Hahaha, Master Hou is truly considerate, Wu is very grateful!" Wu... and ending on The masked person was none other than Yuan Cheng, who had just saved....
Chapter 264, "Supplies Delivered, News from Long Mountain", is the clearest early answer because it turns Yangyuan Pill's situation into a concrete plot event. The setup is Second Year of Great Xia, May 20 Wushuang Giant Stone Camp, Top Floor..., but the pressure keeps building through Greetings, Minister." "Greetings, Minister." Soon, Chen Yingba and Wu....
Chapter 249, "Secret Passage, Han Feng, First Step", is the clearest early answer because the hidden truth stops feeling like mere subtext. A useful checkpoint is the way the scene starts with Xia Hong paused, his tone mildly stern, "Hou Hu's provocation has... and follows through with Seal this passage and prepare to send people to take over Gourd....
Chapter 179, "Tigers Fall, Witnessing and Floral Heart [Happy New Year]", is the clearest early answer because it turns Tigers Fall's situation into a concrete plot event. It opens with These beasts, they have completely lost people's hearts. and closes on Seated on the chair, Xia Chuan turned his head to look at Liu Erhu....
Chapter 296, "Keen Instincts, Rallying the Troops, Bai Qiucheng's Cunning Scheme", is the clearest early answer because it turns Li Xuanping's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The forty-eighth year of Longyou, June 22 At the first light of dawn,... and follows through with The leader is right; I was too naive!" From the brief encounters with....
Chapter 172, "The Competitions Ends, Surprises Galore", is the clearest early answer because it turns Great Xia's situation into a concrete plot event. The chapter gives readers a real answer by opening on Who the hell is dragging me... and ending on Isn't it amazing?" Now Yuwen Dao's eyes were not just curious but....