my girlfriend sent me a message that I'm a special friend so what does she mean?

It is possible that your girlfriend is trying to express her feelings for you in a more subtle way. By calling you a "special friend," she may be indicating that she values and cherishes your relationship and sees you as someone important in her life. It could also mean that she sees you as more than just a regular friend, but may not be ready to use terms like "boyfriend" yet. It's important to communicate with her and ask for clarification if you are unsure about her intentions.