I think that we often assume that because forgiveness has been extended, that Trust has been restored with it. We need remember that trust and forgiveness are two separate issues. A person can repent, be forgiven long before he or she can earn trust again. We need to remember that just as the problem may have taken years to develop into what it is, it will take TIME to resolve.
"....being patient and understanding does not mean condoning, accepting, or enabling their partner’s behavior. It is critical that they establish clear, healthy boundaries and that their husband or wife understands what kinds of behaviors will not be tolerated." Michael Gardiner
I believe that Trust can be restored. It takes TIME, EFFORT, and CONSISTENT behavior that warrants that trust. I think Trust is harder to gain than forgiveness is.