First of all, you should apologize to your girlfriend immediately to express your sincerity and guilt. Tell her you didn't turn off the phone on purpose but because it was out of battery or for some other reason. Make sure your apology is sincere and that you admit you were wrong.
After apologizing, give your girlfriend enough space to express her feelings feelings. Listen to her complaints and dissatisfaction without interrupting or defending. Let her know that you understand her emotions and are willing to listen and accept her feelings.
Express your love and care for your girlfriend through words and actions. Tell her how much you care about her and that you are willing to change for her. For example, you could say, "I really love you, and I'm going to keep an eye on my phone battery and make sure this doesn't happen again."
Sometimes a girlfriend may need some time to calm down. Respect her feelings and give her enough time and space to process her emotions. Don't pressure her to forgive you immediately, but wait patiently for her response.
In addition to apologizing and expressing love, through actions It is also very important to prove your sincerity. For example, you can take the initiative to help her complete something, or do something special for her to make up for your mistakes. This will allow her to see your real changes and efforts.
Finally, establishing good communication habits is crucial to maintaining a healthy relationship. Establish some rules and agreements with your girlfriend to avoid similar misunderstandings from happening again. Make sure you communicate openly and resolve issues promptly.
When the phone is turned off and the girlfriend is angry, we should immediately apologize to her, listen to her feelings, and express our love and care through words and actions. At the same time, give her time and space, and use actions to prove our sincerity. Finally, establish good communication habits to avoid similar situations from happening again.