I always want to send text messages to my girlfriend, what should I do?

If it is confirmed that she is your girlfriend, then send it. Because she also wants to receive your message, she may be too busy to reply in a hurry. But she should be willing to receive your message. If you just think she is your girlfriend, but she doesn't think so, then that's a different matter, because that will make her feel annoying, so it depends on the situation. Enough is enough.