Betrayal by a loved on can be a terrible thing. Then, why forgive? However, it can be forgiven over time and depending on the circumstances. Those circumstances are usually the love felt for the person and the legitimate resolution to the matter. Should the love be deep and be returned the same way in return, then the betrayal, no matter what it is, is overwhelming thus making the road to recovery and forgiveness harder and longer.
Should you be in a relationship that there is no deep emotion and cheating does occur, it can hurt when it happens especially since people feel they are to blame for the other person