your very best friend (you thought)

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for almost 8 years I had a very best friend and she loves to have drama in her life all the time and be center of attention, well I fought tooth and nail with her about it and she would get mad and go home call her family up and tell them what happened between her and I, so I had to fight the family also and after awhile things would calm down because she got the attention she wanted, then turn right around and do something different, she always said it was me causing the problems and omg I don't hurt people like she does (did) so anyways I put up with it 7 yrs and 9 months, We are no longer friends because she sent me an email and was calling my husband really nasty names and me. in the subject line of her email it said NOT MY CHOICE, well you make your own choices everyday so I asked her why she said that never would say but anyways I snapped and said enough was enough you don't do things like that to your best friend or matter of fact anyone sorry its so long so was I right or wrong for ending our friendship?