Hi Darren.
I'm sorry that you have to be another person to suffer the pain of betrayal by your spouse, but welcome to our little group.
Your M(marriage) does not have a chance of recovery until she ends all contact with OM(other man) and commits to a plan of marital recovery a la MB(Marriage Builders) with counseling with a professional truly dedicated to save M's. If she doesn't end contact with OM she'll get emotionally sucked back to square one and once more she'll want to leave you for him.
Be ready and grab tight to go thru what is referred to here as the emotional rollercoaster. Your WW(wayward wife) will go thru withdrawl, similar to the withdrawl that drug addicts go thru when they are trying to kick the habit. The best way to deal with the highs and lows of the rollercoaster is to detach emotionally from your WW otherwise the emotional whipsaws will leave you emotionally drained and without any energy to go thru recovery if and when she finally wants to rebuild the M.
Unfortunately there is nothing you can do to stop the affairees from ending their A, but what you CAN do is:
1.Read the Harley books 'Surviving an affair''His needs Her needs' and 'Love busters'.
2..Not feed their A with your 'love busters' (angry outbursts,selfish demands, disrespectful judgements,dishonest behavior,annoying habits, and independent behavior).
3.Follow
Plan A and Plan B.
4.Follow
Michelle Weiner Davis Divorce busting's 180 degree list.
The good thing about A(affairs) is that even when the affairees get the chance to live out the R(relationship) in the open, the A tends to self destruct because the ingredients that made it possible (lies and deception) tend to turn on the R. Of course this is poor consolation to you right now but it is some little bit of good news that you can rely on.
You are not alone, we were where you are right now and no matter what happens with your M, you WILL not only survive but thrive.