Cheaters Always Lose

Being unfaithful in a relationship is horrible, but there is a bigger picture here. You have to realize that a cheating wife may be the result of a problem in your relationship. If she's deceiving you by getting cuddly with another man, it could mean that she is going elsewhere to find what your relationship lacks --
 which doesn't make her actions right, but only less despicable.If you discover that she cheated on you, there are a few questions you must ask yourself:
Can you trust her again?If the answer is no: You can't get back together.If the answer is yes: It may take time, but you can give it another try. You'll have to tell her that it'll be hard to trust her, but with her help and time, it can happen.
Why do you think she did it?If she doesn't tell you why: You'll have to evaluate whether you can still forgive her.If it has to do with your relationship: When you're ready, you can work on the problems in your relationship.
Is your relationship worth another try?If you can move past her deceit and give her another chance, then when you're ready, sit down, talk to her, and try to understand why she did it. There may be no reason at all (it could just be the fault of stupidity with a pinch of vodka), but if there is a reason why she cheated on you, then ignoring why she did it can lead it to happen again -- and then you'll be cheating yourself.
once a cheater...We all make mistakes, which doesn't make cheating acceptable, but if she shows remorse for her actions and if she's worth the effort of giving it another shot, then you can forgive -- although you may need more time to forget.