This grl is mad at me becuz she thinks I called her a slut I like her?

We went out twice and wen i heard she was also talkin to my cuzin I thought my cuzin was stealing her from me cuz he done it b4 wit other grls so I told her my cuzin told me ur family is a slut and it was true he did really tell me that than she got mad at my cuzin and didn't talk to him later her dad knew bout it too and got mad and went to my cuzins house to ask him y did he call tet family a slut and cuzin said he didn't than they wanted to talk to me bout it than I jus ended up sayin he didnt really tell me they r sluts cuz I was ganna get beat up too but now the grl is mad at me for lieing and won't talk to me help