In some fanfiction, Fleur might be in love with someone else already. For example, she could be secretly pining for Bill Weasley from the start. So when Harry shows interest, she rejects him because her heart belongs to another. Also, their cultural backgrounds, Harry being a British wizard and Fleur being French - Veela, could lead to misunderstandings that result in rejection.
One possible reason could be differences in their personalities. Harry is often portrayed as more down - to - earth and Fleur as more haughty in the books. In fanfiction, this might be exaggerated, causing her to reject him. Maybe she doesn't like his fame either, as Harry is 'the Boy Who Lived' and always in the spotlight, which she might find tiresome.
It could be that Fleur views Harry as too young or immature for her. She might be looking for someone more established in the wizarding world, with more experience and a certain level of sophistication. Harry, despite his heroics, might still come across as a bit of a naive boy in her eyes, leading to her rejection of him.
Sometimes, Harry might use the rejection as motivation. He could focus more on his training or other important tasks at hand, like fighting against the Dark forces. He realizes that he has bigger things to worry about than a failed romantic pursuit, and this rejection could fuel his determination to prove himself.
One reason could be a misinformation campaign. Some malicious wizard or witch might have spread false rumors about Harry, making everyone believe that he has done something terrible like being in league with Voldemort again.
Often, 'Harry Potter' rejected fanfiction is due to copyright issues. If the fanfic seems to be too much of a rip - off of the original story, without adding any new or interesting twists, it may be rejected. Some fanfictions might also be rejected because they deviate too much from the characters' personalities as established in the books. For instance, if a fanfic makes Hermione completely out of character by making her overly aggressive for no good reason, it could face rejection.
One possible reason could be Fleur's unique charm. She is part - Veela, which gives her an alluring quality that might make Harry feel insecure. Another reason might be her skills. If in the fanfiction she is shown to be extremely talented in magic, especially in areas where Harry struggles, it could trigger his jealousy.
In some fanfictions, it could be due to a prophecy or a magical bond that they discover. They might feel that the only way to fulfill the prophecy or strengthen the bond is by getting married secretly. Another aspect could be the political situation in the wizarding world. There could be political factions that would oppose their union for various reasons, such as Harry being seen as a symbol of a certain side and Fleur being from a different background. So, to avoid political turmoil or to keep their relationship safe from political manipulation, they choose to marry secretly.
In some fanfictions, Fleur might leave Bill for Harry because she realizes that Harry has a certain selfless quality that she admires more. Harry's constant fight against evil and his willingness to sacrifice himself could be very appealing to Fleur. Also, it could be that the fanfiction is set in a situation where Bill is involved in something that Fleur morally opposes, and Harry represents a more morally upright choice for her.
One possible reason could be that Harry admires Bill's adventurous past and Fleur's beauty. He might feel a bit envious because Bill has had these exciting experiences and Fleur seems so alluring. Also, Harry might be jealous of their relationship as he himself has had some difficulties in his own romantic pursuits.
It could also be due to differences in their personalities or goals. If Harry is very adventurous and his mate is more cautious, they might not see eye - to - eye on certain important matters. And this fundamental difference could lead to the mate rejecting Harry.
One possible reason could be jealousy. Maybe Harry has some special abilities or has received more attention than his mates, which makes them envious. Another reason might be a misunderstanding. Harry could have been misinterpreted by his mates due to some miscommunication or false rumors.
Perhaps the father is under the influence of some external force. In fanfiction, it could be that he is being blackmailed or controlled by a dark wizard. As a result, he has to reject Harry against his true feelings. Also, it could be that the father has made some big mistakes in his life and he doesn't want Harry to be associated with him because he thinks it will bring harm to Harry.