If a girl says to a boy that he is the solution to her problems, it typically implies that the boy is a significant source of support and comfort in her life. It can be a positive and affectionate way of expressing gratitude and appreciation for the boy's presence and assistance.
This statement might mean that the boy has been helpful in solving her issues, providing emotional support, or making her life better in some way. He could be someone she can rely on during difficult times, a person who understands and listens to her problems, and someone who helps her find solutions to challenges she faces.
In a romantic context, this statement could also indicate that the girl sees the boy as a pillar of strength and a source of happiness in her life. It might signify a deep emotional connection and the perception that he brings positivity and stability.
Overall, the exact meaning of this statement can vary depending on the context and the relationship between the girl and the boy. It's essential to consider the specific circumstances and dynamics between them to understand the sentiment fully.