Why was my girlfriend mad at me when she found out about my surprise birthday party?

Anonymous

I (30) and my girlfriend (25) are in a long-distance relationship. Her birthday is coming up next month and I want to make a surprise birthday video that compiles my birthday greetings and her close friend's birthday greetings to her. She accidentally found out my secret surprise from one of her close friends. She confronted me and told me to stop planning this whole thing, and by looking at her reaction, she was angry at me. I am baffled by her reaction cause I always knew this was going to be a great surprise for her since it's my first time editing a video for her, so I want it to be a special one for her and I know girls love surprises. Her reaction to it feels like a 180-degree turn of surprise. I am speechless. Can anyone explain or share an opinion on my question about why my girlfriend is mad at me and asked me to put it to a stop when she found out about my surprise plan for her?

Why was my girlfriend mad at me when she found out about my surprise birthday party?
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