Harry could also become very withdrawn. He might isolate himself from his friends and the world around him. He'll spend a lot of time alone, thinking about what went wrong and blaming himself. He might even stop doing the things he loves, like practicing magic or playing Quidditch.
He might be initially in shock. Harry could stand there, unable to believe what has just happened. Then he might become angry, lashing out at his mate or the situation in general. He could say things he doesn't really mean in the heat of the moment.
Harry might be deeply hurt. He may initially be in denial, not believing that Severus is rejecting him. After all, he may have felt a strong connection. So, he could try to reach out to Severus multiple times, hoping to change his mind.
Harry could be initially shocked and hurt. After all, having your potential mate reject you is a very painful experience. He might start to question himself and wonder what he did wrong. Then, he could become angry. Given his Gryffindor nature, he might confront Draco about the rejection and demand an explanation.
Alternatively, Ginny could be very mature about it. She might respect Harry's decision, even though it hurts. She could choose to step back and give Harry the space he seems to need while secretly hoping that he will change his mind in the future.
He may also get angry. Harry has a strong sense of justice and self - worth. Snape's rejection could be seen as unfair in his eyes, especially if he has started to develop some sort of positive feelings towards Snape. So, he might lash out at Snape or even try to prove him wrong by becoming more independent and successful on his own.
At first, Harry would be confused. He has always seen Snape as a complex figure, and the idea of being rejected as a son would be a shock. He might start to question his own self - worth, thinking that if Snape doesn't want him, there must be something wrong with him. As time passes, he could grow bitter towards Snape, but also use this as motivation to become stronger. He might focus on his friends and the positive relationships in his life, trying to move on from Snape's rejection while still carrying the pain deep inside.
Perhaps Harry just stands there, silently crying at first. He might be in shock that Snape has been so cruel. Then, he could start to think about what Snape has said or done, trying to understand if there is any truth in it. Harry is a deep thinker, and this situation might force him to re - evaluate his relationship with Snape and his own actions in Hogwarts.
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.
Another way the plot could develop is that Harry's rejection of Hogwarts causes a rift in the wizarding world. Some support his decision, seeing it as a brave step towards change, while others condemn him. This leads to a power struggle between different factions. Harry then has to navigate through this complex political situation, trying to prove that his way is better while also facing the challenges of being an outcast from the traditional Hogwarts - centered wizarding society.
He might be initially heartbroken. Harry has deep feelings for Hermione, so the rejection could come as a shock. He could withdraw into himself for a while, feeling sad and confused about why she doesn't feel the same way.
He might be initially panicked. Since his glasses are essential for him to see clearly, not having them would make him feel very vulnerable and exposed in a dangerous wizarding world.