If your girlfriend is angry, here are some words that may help her and make her feel better:
1. "I love you. I care about our relationship very much. I will try my best to make you feel happy and satisfied. I really want to solve this problem. Let's work together to find a solution."
2. "I understand that I made a mistake, and I regret it very much. I know that this has caused you trouble and pain, and I'm really sorry for you. I hope we can work together to avoid this happening again."
3. "You are very important to me. I can't live without you. I understand the problems in our relationship, and I am willing to work hard to solve these problems for our future."
4. "I understand why you are angry, and I will try my best to avoid making the same mistake again. I need your help, and I hope we can grow and improve together."
5. "I love you not only because of your appearance and character, but also because of your inner. I appreciate your wisdom, kindness and courage. I want to spend all the good times in life with you. No matter what difficulties we encounter, I believe we can overcome them together."
Most importantly, you need to convey these words with sincere tone and expression, so that she can feel your sincerity and concern. At the same time, take positive actions to correct your mistakes and keep your promises.