I would do anything for my sister but she continues to treat me horribly. What can I do?

Time and time again she shows me with her actions that she doesn't care about me or my feelings. She expects the world to bend Iver backwards fir her but is careless when she hurts other people. Today I expressed to her that I felt exhausted always being there for her and she still treats me bad but she didn't care.

I would do anything for my sister but she continues to treat me horribly. What can I do?
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