All I did was text my best friend's crush, help!?

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I'm a freshman and one of my really good friends is a junior. She liked this junior for 8 months. However, at a football game I was third wheeling with them because I thought he liked her and they were being flirty. Then he dm'd me on twitter and got my snapchat name.

We then began to snapchat and she found out. She told me to just not respond and I was like okay, but really I didn't think I was doing anything wrong so I still did it. We weren't that flirty with each other but we were. Then he kept asking for my number but I had to keep saying no because that wouldn't be right.

Then, he got it from his friend and started texting me for not even 24 hours. We went out for lunch so that I could tell her but when she read between our messages she flipped out. I apologized and told her I was going to tell her today but she got really upset and mad. I texted her saying I'm sorry but never got a response. What should I do? Did I really do anything wrong? Helppppp!