One thing I will applaud is the heart to forgive and once we are able to forgive the person that wrong us then we have already taken the first step which is very important.
I know how annoying human beings are when it comes to hurting people and this always pains more when you happen to be in a relationship with someone whom you love so so dearly and wouldn't want to loose the person. But this is a different thing anyway.
When someone hurts you dearly and you can get to forget about it even after forgiven the person, I will suggest you refuse the way which you communicate with this person in play so that you won't be affected that much.
There is a saying about forgive and forget. Sometimes we may forgive but for us to forget most times don't happen right away sometimes it takes time to heal l.
So this will only happened when we take our mind of it and give it enough time to heal and do as much as possible not to think about it.