Could someone help me?i feel sad Because my best friend

is ignoring me and being very rude.Such as calling me names,ignoring,and spreading rumors that are not true!when I try to confront her she looks away and pretends she does not know me.so I hand wrote her a letter that said is she could treat me better.even though it had HER name on it she handed it to my friend Damian which almost made him cry until I explained it to him.so I re-gave her the letter and she told everyone that I was telling her she was GOTH!Then nobody would talk to me.CAN ANYONE GIVE ME SOME ADVICE ON WHAT I SHOULD DO!!!!