What is to be done about the psychological struggle between the desire for revenge and the feeling of cowardice after a fight at school?

Since you two have reconciled, you have waived your right against him, so it is not permissible for you to transgress against him. We remind you of the immense reward for pardoning and forgiving wrongdoers, and keeping this in mind will alleviate what you are experiencing. We advise you to take care of yourself regarding food and other matters; for your body has a right over you.