我想我并未成熟到原谅背叛
[wŏ xiăng wŏ bìng wèi chéng shú dào yuán liàng bèi pàn]
It suggests that someone still carries resentment over past betrayals and doesn't believe he/she is mature enough to forgive such behavior. It indicates some unresolved issues with emotional growth and forgiveness in interpersonal relations.