My best friend she is upset with me what do I have to?

my best friend is angry with me. we became best friends very soon and we were working together for two or three months, but after I left my that job so she was not calling me and I was upset twice she was online but I did not answer after that I planned not to chat and call her and she did not call or message me either. now what do I have to do I dont want to loos her I want her mine and I want to marry her.

placeholder text for bug in Chrome