What could be the reasons for Annabeth leaving Percy in the 'annabeth gets pregnant and leaves percy fanfiction'?

Well, Percy is a complex character. His reaction could depend on how much he knew about the pregnancy before Annabeth left. If it was a complete surprise, he might be in denial for a while. He could also start to blame himself, thinking he had somehow failed her. And then he might eventually turn that pain into a determination to be a better person, whether or not he ever sees Annabeth again.

One possible reason could be a misunderstanding. Maybe there was a miscommunication between Annabeth and Percy about their future plans or how to raise their child. Another reason might be some external threat that Annabeth believes she can face alone to protect her family, so she leaves them behind. It could also be that she has some personal issues to deal with, like an identity crisis, which makes her think she's not fit to be with them for the time being.

Perhaps Percy forgets an important promise he made to Annabeth. In their relationship, promises are significant. If he fails to keep one, like a promise to help her with a project or be at a certain place at a certain time, Annabeth would surely be mad. It could also be that Percy accidentally breaks one of Annabeth's creations or possessions, which she holds dear.

Perhaps there are external factors at play. The world of demigods is full of chaos and danger. Reyna might be in a position where Percy feels he has to be by her side to protect her or to fulfill some greater prophecy that involves the two of them, and this leads to him leaving Annabeth.

Another possibility is that in the fanfiction, Percy might feel pressured by the expectations of their relationship. He could be afraid that he can't live up to what everyone expects of him as Annabeth's partner. So, he leaves in an attempt to find himself and figure out who he is without that pressure.

Well, one possible reason could be that Percy made a really stupid decision without consulting Annabeth first. Like, if he went off on a dangerous mission on his own when they were supposed to be a team. Annabeth is a very strategic person and she might feel betrayed or extremely frustrated by such actions.

It could also be due to some sort of magic or mind - control. A powerful enemy might have cast a spell on Annabeth, forcing her to turn against Percy. In this case, it's not really her own will but the result of external manipulation.

Annabeth could be under some kind of magical influence. In the Percy Jackson universe, there are many magical elements. She could be cursed or charmed without her knowledge. This would be a very interesting take in a fanfiction as it would add an element of mystery and also give her a chance for redemption once the truth is discovered. Also, it could be that she has some internal insecurities that she hasn't dealt with and they manifest in this way, making her act out of character.

One possible plot twist could be the discovery of some hidden power in their unborn child. In the world of Percy Jackson, powers are often unexpected. Maybe the baby has a unique ability related to both Annabeth's wisdom and Percy's water - controlling powers. This could lead to various adventures as they try to protect the baby from those who might want to use its power for evil.

One possible reason could be a misunderstanding. Maybe she saw Percy doing something that she misinterpreted as a betrayal of their friendship or their cause. For example, if Percy was seen talking secretly with an enemy, Annabeth might jump to conclusions without knowing the full story.