Most of us tell ourselves that if our partner cheats that we will be done with the relationship. However, more and more couples are realizing that is easier said than done. When an affair occurs in a relationship this is a good time to seek outside support which can be found through couples therapy. The below link speaks to the different phases that occur after an affair is discovered, the crisis phase, the insight phase, and last the vision phase. In order to maneuver between these phases it can help to be able to have a non-judgmental space where discussions and techniques can assist in the different phases that occur.
Being that there is a lot of intense emotions involved it can be helpful to receive tools and techniques to be able to work through these emotions. Often times the pain gets in the way of movement and the underlying roots are never even touched. Know that there is a way to move through the pain and actually come out on the other side with a stronger partnership.
Please see THIS resource for more information on getting over an affair