My family HATE me and it is all my "cousins" fault?

Me and my cousin (zoe) were on Facebook 1 nite and she asked me if my brothers girlfriend was pregnant so I said no, my mum saw and we decided to tell my brothers girlfriend what was being said about her, she just laughed it off but then my other cousin started txting my brother and her saying, things like fat slag and u r pregnant, it caused problems in their happy relationship and they split up, now the cousin who asked me told her parents that i was lying and that she never said that, so they txt my mum calling me a liar, then my cousin admitted to it they said, that's all she did as if that was okay, last year I wasbridesmaid for one of my other cousins and now she wont talk to me even though we were so close b4. I have tried contacting my cousin and her sister but they dont want to know, I have tried talking to my cousin that got married but she doesn't want to know either, my mum and zoes mum were in tescos and i have never liked her but she stood there talking about me, as if i wasn't there, now my brother and his gf are back 2gether and every1 is happy, but the rest of my family hate me :( Xx