A girl often sends text messages to a boy. What does this mean?

Sending a text message doesn't mean anything, it depends on the content of the message. If she just sends some daily chats, then she regards this boy as a good listener or a friend to talk to. If the message she sent is a little ambiguous, it may be that she likes that boy a little. But no one can say for sure about this kind of thing, because no one can guess what girls are thinking, so it is up to boys to find their own way. Knowing the answer, no one can help. This is between boys and girls. If you want to know the answer, talk to her once. Find a place to talk about each other's worries, and there may be unexpected gains.