Know what's hard? Not dwelling on an offense you have received. You sit and pour over it, replaying the events over and over in your head.
In a lot of ways we assume that by forgiving someone that this means the wrong never happened. Or, we think that by forgiving someone that this offer of forgiveness is only going to impact them. But the reality is, forgiveness, more times than not, actually benefits the forgiver far and above the one who has been forgiven.
Believe it or not, forgiveness (or lack of it) can become a barrier between you and God (as well as you and others). It's true! Think about it, if you're bitter, and angry, and carrying this unforgiveness around you're probably a very miserable person to be around.