While she handled it immaturely, to do this to her is just being as immature. You are an adult (I hope so, you are married) and you should act like one. So you can't help how you feel and you guys were both emotionally cheating on your partners, but you should understand that what you both were doing is wrong and that you guys don't have a future together as long as you are married and she is seeing other people.
So what are you going to do? End your marriage in hopes that you guys can live happily ever after? Even if you were to end your marriage, there is no guarentee you guys would work out, if she would even return your calls.
I think you should more concentrate on WHY you want to be with somebody else that isn't your wife. There's a reason and you should find it. If you do care about your wife, you should be working on making the marriage better. I can bet alot of money on the fact that while you are infatuated with somebody else, your marriage at home is suffering.
Waking up next to a beautiful girl,
Step outside and say hello to my beautiful world.