My girlfriend texted me that she broke up with me. She never answers the phone. She just texted me. What should I do?

Try to give her a period of time to calm down and learn about her recent events through friends. If it's because she doesn't love you, then let go smartly. If you encounter something that can't be solved and don't want to implicate you, you should try to communicate with her and let her know that you can share joys and sorrows with her.