I want to ask my girlfriend why she is very angry with me for 15 days. I apologized lots of times. I tried everything, but she hasn't replied to me and I am upset. What can I do?

We both lives in different country that's why I cannot go front of her and apologize.
I want to ask my girlfriend why she is very angry with me for 15 days. I apologized lots of times. I tried everything, but she hasn't replied to me and I am upset. What can I do?
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