Hartbroken,
I read your story. One (postitive) thought that I had was that your wife voluntarily confessed to you. That is a very positive sign. Did your wife tell you why she chose to confess to you? It is not uncommon for an unfaithful spouse to lie repeatedly about an affair...even if their spouse is suspicious. If your wife was honest with you because she is remorseful and needed to be honest with you...then that tells me that she truly wants to be in an honest and loving marriage with you.
Now the hard part....you have to sort through this mess and deal with the fact that she still sees OM at work.
Can you speak openly to your wife about your thoughts and feelings regarding her affair and regarding the OM? If not, then you and your wife will need to work on this in order to help you (and the marriage) move forward. If you can talk to her, then you need to tell her how you feel. Explain your sadness and your insecurities...and tell her that she need to be 'an open book' with you. That means that if your wife and OM have some communication during the day, your wife needs to tell you about it. If OM makes any inappropriate contact with your wife, then she needs to be honest with you about that also. At some point (now is likely too soon) you will need to begin to trust your wife again...and her openness and honesty with you will help you to feel that she is trustworthy.
It may be helpful for you to read some of the articles and books in our Helpful Links section (see the left hand column of the screen). It will help you to work through some of your pain as well as provide reasonable expectations of your wife.
Right now, you are hurting and that's okay too. You are going to hurt for awhile...and that is to be expected considering how painful it is to realize that your spouse has cheated. If your wife wants to be in the marriage, then she needs to take responsibility for your pain and help you through it.
We also are here for you....so post and vent anytime!