Perhaps Ginny herself has some post - war trauma that she needs to sort out on her own. She might feel that if she gets involved with Harry at that moment, it will complicate her own healing process. So, she ignores him as a form of self - preservation.
It could be that there were some misunderstandings during the war. Maybe Harry made some decisions that Ginny didn't fully understand or agree with. And now, after the war, she's angry or disappointed with him, which leads to her ignoring him.
One possible reason could be that Ginny has seen Harry change a great deal during the war. Maybe the war has left Harry with a lot of emotional baggage that he's not dealing with well, and Ginny doesn't know how to handle it. So, she decides to give him some space by ignoring him for a while.
One possible reason could be miscommunication. Maybe Harry made a decision during the post - war rebuilding without consulting Ginny, and she felt left out or disrespected. For example, if he agreed to some dangerous mission without telling her.
One possible reason could be a growing apart due to their different career paths. Harry, being deeply involved in the wizarding world's security and Ginny having her own Quidditch career. Another reason might be the stress of living in the public eye. Their relationship may not be able to withstand the constant scrutiny and pressure from the wizarding community.
At first, Harry might be confused. He's used to Ginny being there for him, and suddenly she's ignoring him. He might try to reach out to her a few times, but when she doesn't respond, he could become a bit withdrawn himself, thinking that he's done something wrong.
One possible reason could be the trauma they both endured during the war. Ginny might be frustrated with Harry's withdrawn behavior as he tries to deal with his own demons. Maybe he's been neglecting their relationship in his post - war self - reflection.
One possible reason could be miscommunication. Maybe Ginny feels neglected by Harry because he's so caught up in his own heroic deeds and doesn't pay enough attention to her. So she might seek comfort or excitement elsewhere.
Some fanfictions might depict them as having a more adventurous post - war life. They could be involved in rebuilding the wizarding world in a more hands - on way. Harry might use his fame and Ginny her popularity among the younger wizards to bring about positive changes. Their relationship would be based on mutual respect and a shared goal of making the wizarding world a better place.
One possible reason could be that Harry is too focused on his fight against Voldemort and doesn't want to put Ginny in danger. He might think that being with her would make her a target for his enemies.
One reason could be to escape the public spotlight. After the war, Harry is a hero and Ginny is his girlfriend. They might feel overwhelmed by all the attention and want a quiet life, so they run away.
One possible reason could be the trauma they both endured during the war. Harry especially might have post - war issues that make it difficult for him to be in a relationship. He could be haunted by the deaths he witnessed and feel unworthy of love. Ginny, on the other hand, might have grown tired of waiting for Harry to fully recover. Another reason could be the different paths they want to take in life post - war. Harry might feel a strong sense of duty to help rebuild the wizarding world in a way that doesn't involve a relationship, while Ginny may want a more stable family - oriented life right away.
One possible reason could be that he might fear for Ginny's safety. In the wizarding world, there are always threats from dark forces. Harry has already lost many people he loves, and he might not want Ginny to be in more danger because of their relationship. Another reason could be that he wants to focus on his own personal growth and exploration. Harry has spent so much of his life fighting Voldemort and dealing with the wizarding world's problems that he may feel he needs time alone to figure out who he really is without the added pressure of a marriage.