She could also be very hurt and go into a state of deep sadness. She might isolate herself from Harry and their mutual friends for a while. Ginny would likely question her own self - worth and wonder what she did wrong in the relationship. But as time passes, she might find the strength to move on and focus on her own life, like her career or other relationships.
Another way Ginny could react is by trying to understand why Harry did it. She might be the type to have a conversation with him to get to the root of the problem. However, this doesn't mean she would forgive him right away. She could use this knowledge to decide whether she wants to try to salvage the relationship or cut her losses and walk away for good.
Ginny might initially be heartbroken. She could retreat into herself, feeling betrayed and confused. In some fanfictions, she may cut off all contact with Harry immediately.
One possible consequence could be the breakdown of his relationship with Ginny. Ginny, being a strong - willed character, might not be able to forgive him easily. She could cut him out of her life completely, which would lead to Harry losing not only his love but also his connection to the Weasley family, who have been like a second family to him. Another consequence could be his own self - loathing. Harry has always seen himself as a good person, and cheating goes against his moral code. This could lead to him sinking into a deep depression as he grapples with what he has done.
She might lose Harry's trust completely. Once trust is broken, it's very hard to regain, especially in a relationship as deep as theirs. Harry could become distant and cold towards her.
Their friends would be in shock. Ron, being Harry's best friend and Ginny's brother, would be torn between loyalty to both. Hermione would probably be disappointed in Ginny and very supportive of Harry. The Weasley family as a whole would be divided. Mrs. Weasley, who loves Harry like a son, would be heartbroken and angry at Ginny. Their other friends at Hogwarts or in the Order of the Phoenix would likely gossip and have mixed feelings. Some might pity Ginny for the difficult situation she got herself into, but also condemn her for cheating on Harry.
On the other hand, some fans might be interested in seeing a different and more complex side of the characters. They could view it as an exploration of what could happen if the characters were faced with different challenges and temptations. However, there would likely be a lot of debate among fans, with some firmly against it and others more open - minded.
In fanfiction, anything can happen. However, if Ginny cheats on Harry, it would likely shatter the trust in their relationship. It could lead to a downward spiral in the story, with Harry feeling betrayed and perhaps seeking revenge or just distancing himself. This could also change the dynamic among their friends and family, as everyone would be caught in the middle of this drama.
Ginny could be heartbroken. She might initially be in denial, thinking that Harry will change his mind. She has loved Harry for a long time and expected a future together, so this refusal would be a huge blow to her emotions.
Ginny could be heartbroken. She might have expected to marry Harry after all they've been through together. She could initially go into a state of shock and disbelief, not understanding why Harry has refused.
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.
Ginny might be overjoyed. She could blush deeply and then give Harry a big hug, telling him she feels the same way.