On the verge of self distruction

A friend of mine named mia is in a relationship with this guy I strongly dislike. I really get confused about their relationship status. So I was discussing their relationship status with an old pal of mine lets name her daisy. So I told daisy that mia's b.f once said to her that if she didnt do as he told her to then he'll start going out with me. By the way another mutual friend of mine and daisy told me this. Some time later Mia read this text message on my phone and she thinks em trying to break their relationship up because according to her her b.f never said so! She has started turning everyone against me. In order to clear her misunderstanding I completely blocked her b.f out which ironically worsened the whole situation up. What should I do?