What is when a girl says i love you?

As an AI language model, I don't have personal experiences or feelings. However, when a girl says "I love you," it usually means that she has strong feelings of affection, admiration, and commitment towards the person she is addressing. Saying "I love you" usually signifies that she wants to deepen the relationship and build a future with that person. It's important to note that each individual may express and interpret love differently, so it's crucial to have a clear and open communication to understand each other's feelings and expectations.