Thanks guys!!!! Is there anyway of backpedalling on this without sounding like an ass...?
Yes easily, I've outlined the "script", just like she can change her mind about you and has several times, you can do the same, be prepared to put on the performance of a lifetime, you need to sell it, you need to make her believe that those words really are the way you feel. (in fact they should be but you're still a love sick puppy, you're just too obvious)
If you don't do any of this, if you go back to what you had and go in her direction, you will end up in the same place as you were previously and she will experience another "indiscretion", maybe next time she can invite you over to watch so that you can see how a real man will handle her ;-)
Sorry bro, I know that shot is below the belt but sometimes you guys need a wake up call. And before you say that your wife would never do that to you, I'm sure you believed your wife would never have cheated on you in the first place too! Just remember, the first time they cheat is the hardest, it becomes easier to do it again and again afterwards.