My sister blocked me on fb and I don't even know why.. what can I do?

Anonymous
My sister blocked me on fb and I can't get over it.. I've always been good to her..she didn't even tell me why.. The last thing I said to her was I love you sis. I was going through my messages and it showed she blocked me. When I found out I felt a literal pain in my heart and without crying tears just came down
My sister blocked me on fb and I don't even know why.. what can I do?
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