Was this rude of me to word it like this?

I'm a freshman in high school who cares more about keeping her grades above a 95% than keeping some random guy who hasn't talked to her for four years straight. I can reject people without caring, but was I rude at all about it? Direct is the best policy to me. This person went to someone else who has my phone number and got it from that person instead of just asking me and then he tried to mimic the way I text two times, both of which I find absolutely revolting...