"Enough is enough" is a proverb in China, which means "breaking the silence or covering up", meaning that the relationship between the two sides has reached the point where it can be said. If a female classmate "doesn't want to break the window" on homosexuality theory, it may mean that she doesn't want the relationship between the two sides to become too direct or too clear.

The meaning of this sentence may mean that she likes or cares about male students to some extent, but she doesn't want this feeling to develop into a love relationship. She may want to keep this specious distance, or maintain a friendship or ambiguous relationship.

But the specific meaning of this sentence may be different due to different situations and contexts, so more background information is needed to understand it accurately.