He could also give his mate some space for a while. Sometimes, distance can make the heart grow fonder. By giving space, his mate might have time to think about their relationship and realize what they are missing.
Harry could try to communicate openly with his mates. He can explain his side of the story and clear up any misunderstandings. This might be difficult at first, but it's a direct approach.
In some fanfictions, Draco might initially become withdrawn. He could isolate himself from others, brooding over the rejection. For example, he might stop participating in social events he used to enjoy.
Harry could try to find out the root cause of the rejection. He might start investigating if there are any external influences on his mates. He could also reach out to other characters for support, like some of the Hogwarts professors. And he might try to prove himself to his mates, by showing them that he's still the same Harry they used to know deep down.
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.
He should focus on self - improvement. Maybe work on his flaws like his impulsiveness or become more reliable. Percy could also try to expand his social circle. By meeting new people, he might find someone who appreciates him for who he is. He could also throw himself into his hobbies or work. If he likes fishing, he can spend more time fishing to take his mind off the rejection and also gain a sense of accomplishment.
He might be initially heartbroken. Harry has always been a bit of an emotional person, so he could go into a state of depression for a while. He might isolate himself from his friends and focus only on his studies or fighting against the dark forces, using it as a way to distract himself from the pain of the rejection.
One possible reason could be a misunderstanding. Maybe his mate misinterprets something Harry does or says. For example, if Harry is often away on dangerous adventures, his mate might think he doesn't care about their relationship and reject him.
Just accept it and move on. There's no point in dwelling on it. There are plenty of other fish in the sea.
One reason could be that his mate has different life goals. Maybe she is more focused on her own magical career and doesn't see a relationship with Harry fitting into that at the moment. Another possibility is that there are misunderstandings between them. For example, Harry might have been too involved in some dangerous adventures and his mate thought he didn't value their relationship enough. Also, it could be due to external pressures, like her family or friends not approving of Harry for some reason.
Perhaps Harry tries to find the root cause of the rejection. He might start investigating if there's some sort of dark magic or false rumor spreading about him that has made everyone turn against him. He could question his closest friends or even seek out the help of some of the more reclusive teachers at Hogwarts to figure it out.