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If your partner has never cheated on you before and you've generally gotten along long before this then it would be to your best interest (only if you love them) to sit down and communicate with them and ask why they felt they needed to cheat. Only from their answer will you know whether you should stay with this person or leave. Always remember that humans aren't perfect and make mistakes and a couple can work out their problems if they are usually in the habit of cheating. Forgiving the person is the easiest part, but it will be difficult to trust them for a long while and you are either going to have to decide how much you love this person; are they worth working on the relationship and getting through this rough time or does this person appear dishonest and sneaky most of the time and you feel more unsettled around them and unhappy than you feel happy around. This is the time when you leave.
