First, it is important to listen to her feelings. Don't try to justify or explain your behavior, but give her enough space to express her emotions. Sit back, listen to every word she says, and show that you care and understand.
After she has finished venting, gently express your intention to buy the gift. True intention. Tell her you made this decision out of love and care, and emphasize that you mean no harm. Make sure to convey these messages with a warm, sincere tone.
If your behavior really hurt her, then please have the courage to apologize and take responsibility. Realize your mistake and offer her a sincere apology. Let her know that you understand your mistake and are willing to work on it.
Sometimes, people need some time to calm down and reassess the situation. Respect her feelings and give her some time and space to process her emotions. Don't force her to forgive you immediately, but wait patiently for the right moment.
If possible, provide some remedies for your mistakes. This could be a special date, a thoughtful gift, or another way to show her that you care and love her. Make sure the remedy is in line with her preferences and expectations.
Finally, establishing good communication and trust is the key to solving problems. Communicate openly with her and share your thoughts and feelings. By actively participating in the conversation, you can better understand each other and find ways to solve problems together.
Listening, expressing intentions, apologizing, giving time and space, offering remedies, and building communication and trust are key steps when facing a girlfriend who is angry about buying something. Through these methods, you can better comfort her and solve the problem.