God forgets; People don't

Jeremiah 31:34 (NIV)
No longer will a man teach his neighbor,
or a man his brother, saying, 'Know the Lord,'
because they will all know me,
from the least of them to the greatest,"
declares the Lord.
"For I will forgive their wickedness
and will remember their sins no more."

God's forgiveness is complete. He not only forgives us for the wrong we've done, but He chooses to not even remember them. In His eyes, you are perfectly clean, just like His son.

Our memories, however, stay in tact when we've been hurt. Even if forgiveness has been given you still remember the offense. This is by design.

Since God is omnipotent (all powerful), we really have no power to bring any harm to Him. We can disappoint Him and grieve Him, but we can't hurt him. However, humans do a great job of hurting each other. Even after you forgive someone, they can hurt you again and again. For this reason, God allows us to remember the offense. We have been given this gift so that we don't continually put ourselves in compromising situations that will allow us to repeatedly get hurt from the same injuries. In short, this is a gift of learning.

By learning from our mistakes and knowing who we can trust, it minimizes the chance that we will allow the same person to hurt us in the same way again. Unfortunately, there is a down side to this remembering. It also makes trust a commodity that is difficult to regain. If you are hurt, you are more likely to be cautious to guard yourself from being hurt again. Forgiveness is irrelevant at this point. Self-preservation requires that some trust be withdrawn and reliability be proven before it is restored.

When someone doesn't trust you because of something you've done in the past, remember that you need to show yourself reliable and trustworthy in order to regain their faith in you. New memories must be built to override the old memories. Trust must be built...slowly...and steadily...with care to be trustworthy in the smallest of details.

I hope this encourages you.
I love you for free!