I have learned to understand time and thought as a spiral: neither a straight line that must go always forward, even into a precipice, nor a circle that must remain forever stuck in repeating past experience. Instead, a spiral, which curves always backward in order to curve forward. What makes time and life into a spiral instead of a straight line or an endless circle is setting aside time for reflection, rest, renewal. That renewal time is the curve that moves the spiral onward. This lets us re-view where we have been, so that we can go forward.
Little slights, harsh or unthinking words that sting and hurt, something said or done that has left wounded feelings are not that hard to forgive. No one is perfect and all of us, at one time or another, have done these things without even realizing it. Develop an attitude of constant acceptance and forgiveness as you go about daily life, shrugging off these little things in the realization that only your own attitude is bringing the distress you are feeling about them. Forgive yourself first for getting upset: then forgive the other person – entirely. To really erase the memory, think of something nice about that person and send out vibrations of concern and affection instead. If the person really meant to hurt you, this is entirely disarming! Love conquers all.