Explain why you did whatever it was ....to the person(s) you've hurt and then apologize. If the harm caused was of a serious nature, prepare to apologize profusely and offer to do something good for the person or on behalf of the person, you've hurt (let them make a suggestion if you have nothing in mind). A sincere act of kindness is a good start to mending fences that are severely damaged. If you don't confront what happened, you will always be guilty for it. One of the steps in AA is to make amends to those you have wronged. Makes sense.