Why would she get mad?

So this girl says she don’t like me no more and just sees me as friends. But I’m curious why would she get mad if I told her that her best friend looks like my ex girl friend with a big smiley face? Then I told her dammn your best friend hella y, She look at me I thought she was about to shoot me lol but her best friend when in to the car and I was just looking at her and then we drop her to the bart station. But I want to know if I said something wrong? Well she told me she sees me as friends and doesn’t want to be with nobody why she got hurt ?