What should I do in this case with my ex?

We broke up and my parents took my iPhone away so we couldn t text each other, and my Dad said not to talk to each other, and I was like ok. But my parents let me check my iPhone, and she sent me a message. It was like IIm sorry I hurt you, can we still be friends. I have not talked to her, but was in the same room as her at school, and she was talking about this guy at teh store she works at and how she was going to ask him to prom. And (even though I didn't show it) I was so mad. I was astounded at how much of a… Yeah she was being. What should I do?

She is your EX… So you have no control over her or expectation of involvement in her life anymore. Ignore her and move on.