My girlfriend won't let me read her information. what do you think?

This is everyone's right. Everyone has privacy. You can't read it without the consent of the other party.

The first point; No matter whether she has anything else to happen, you have to believe her when you say that you are in love with Zhao Xin. Calm down and give her some time to deal with her own affairs, and she will give you a satisfactory answer.

The second point; Otherwise she really has other things to do. Maybe she had a boyfriend when she met you. If so, please explain it to her! Let her think about it before making a decision. If you want to be good with you, forget everything in the past. Do you agree to start a new life?