what should i do?who can help me?

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I had the entrance examination for college.many friends asked me how about my exam.i told them "quite good" before the resuilt came out.but actually not.she hearded about it, and then phone me.she laughted at me and said i was a braggart.that made me angry and sad.we have been friends for a long period.she should understand me,shouldn't she?it makes me puzzled.therefore,i asked her why she did like that.her answer was out of my expection.she said the mood today was not good.but did she think that my mood is bad as well becasuse of my bad mark.I told her my thought,but she said "it has nothing to do with me".then i said "if you insist doing like this,we will never be friends." she said"it doesn't matter to me." what should i do?is it my fault?should i keep friendship with her?