I think that was very graceful of you too. Continue to do your work well so that your supervisor will know your true abilities. As for your friend, bear no grudge against him/her, but use this as a chance to witness to him/her and to prove yourself as a reliable friend as well.
Don't worry, no matter what you do, God is there, and He will prepare for you what is best.
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God grades on the cross, not the curve.
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