I'm a professional counselor. Evidence based couple's counselling has proven that a cheating episode can be harnessed to make a relationship even stronger than it was prior to the cheating. This only takes place if the problem as an opportunity to learn how to effectively listen for, express and meet both of your core-relationship needs.
The “corrective-bonding experience” that can come out of learning from an affair can be one of the greatest experiences a relationship has to offer. Please see my hub on the topic an feel free to ask more detailed questions here.