<p>wait... did you tell your teacher that you didn't think you're friend would copy? but just showed it to him to check his work or give him a couple starting points?
I know at my school, teachers encourage students to help each other out, and helping each other out by checking work, etc. is a good thing.</p>
<p>Get over it. People will screw you over so much worse than that in the real world.</p>