Tell her you cheated. You're an absolute disgrace of a human being and a coward. Tell her so she can be with someone who'll love her. You resent her because she moved to be with you? Are you fucking serious? Congrats, you've not only ruined your relationship with your loving wife who upended her entire life for you, but as soon as she finds out (which she will), you'll have gutted and destroyed her.

This is all your fault. Stop whining about feeling guilty. Tell your poor wife what a disgusting piece of shit you are so she can find someone better.