It could be a matter of self - discovery for Percy. He might realize that his relationship with Artemis is holding him back from his true path or personal growth. He could feel that he needs to focus on his own quests and the development of his powers, and a relationship with a goddess as complex as Artemis is just too much of a distraction.
Perhaps it's due to the interference of the gods. The other deities might not approve of their relationship for various reasons. Maybe Zeus, fearing the power that could come from a union between Percy and Artemis, decides to put an end to it. In the world of Percy Jackson, the gods often meddle in the affairs of mortals and demigods, so this could be a factor.
One possible reason could be differences in their duties. Artemis is a goddess dedicated to chastity and the hunt, while Percy has his own quests and loyalties in the demigod world. Their paths might have diverged so much that it led to the break - up. Maybe Artemis felt that Percy's presence was starting to interfere with her commitment to her hunters or her own divine responsibilities.
She could also be angry. Given her power and status, she might feel slighted by Percy. She may take some form of revenge, not in a malicious way but perhaps by making Percy's life a bit more difficult during his quests. For example, she could send her hunters to interfere or withhold some information that could be useful to him.
One reason could be that Percy is loyal to Annabeth. In the original series, his relationship with Annabeth is strong, and he might not want to betray that for Artemis. Artemis is also a virgin goddess, which adds a layer of complexity to any potential relationship.
One possible reason could be a misunderstanding. Maybe Artemis misinterprets Percy's actions as being against her or her hunters. For example, if Percy accidentally endangers one of her hunters during a quest, Artemis might see it as a betrayal of her trust in him.
One possible reason could be differences in their divine natures. Percy is a son of Poseidon, a god associated with the sea and a more fluid, emotional element. Artemis is a virgin goddess of the hunt, very strict and unyielding in her ways. This contrast in their essences might lead to clashes and Percy's dislike.
Well, it could be about Apollo's over - confidence. He might have boasted about his powers or achievements in a way that annoyed Artemis. In the context of the Percy Jackson universe, Artemis is very protective of her domain and those associated with her. If Apollo made a decision regarding something that was under Artemis' purview without consulting her, like interfering in the affairs of the hunters, Artemis would yell at him. Also, Apollo's past mistakes or actions that went against the values of the gods might be brought up by Artemis during her yelling.
One possible reason could be a misinterpretation of a prophecy. Maybe Artemis believes Percy is a threat to the natural order she protects based on a wrongly interpreted prophecy. For example, if a prophecy was worded ambiguously and she thought Percy would bring destruction to the wild, she might take drastic action.
Perhaps Percy hates it because it creates a lot of plot holes and inconsistencies in the world he knows. If there's a son of Artemis in fanfiction, it might mess up the way the gods' relationships and powers work in the original story.
There probably is. The Percy Jackson fandom is quite large and diverse. Writers love to explore different relationships and scenarios. Since Artemis is a significant character in the Percy Jackson universe, it's not surprising that someone might write a fanfic where Percy is her son. It could lead to really interesting plot twists and character developments.
Percy is often characterized as his brave and sometimes impulsive self. He might be shown as being a bit in awe of Artemis at first. Artemis, in fanfiction, is usually depicted as the powerful and independent goddess of the hunt. She has her own set of rules and values that she adheres to strictly.