without boring you with too much information...i have been in the same place as you, it was probably one of the most painful cracks of my heart that i ever experienced, the scar is still there today.
anyways, you cannot look to anywhere but inside yourself for the true, best answer of what to do. only you can truly evaulate your relationship, your trust, your pain and if it is really worth saving or not. People are so quick to reply "Dump her! / Forgive her!" but these people do not know you, they have not seen you and your wife together for almost a decade. Your friends and family can be insightful and helpful, but the solution will come from within you. It should not be a hasty one, it might not hit you for a month, or more. It's not a trivial one, you need to think it over.
at the risk of running onto another tangent, a lot of the "advice" i see posted seems incredibly ignorant, coming from a vast collective of timid and pathetic inexperience. I'm guessing that you might want to take the average ATOT'ers girl advice with a grain (or 4) of salt. I am just guessing that the majority of people on this forum have not found and nurtured a loving relationship for as long as you, if at all.
Anyways, that is all I can tell you. The pain burns and throbs terribly now, but the inevitable hands of time will always soothe, even if you might not believe that right now. Think over, relflect. Alone, with friends, with her, or with a counselor. The right choice will come to you.
Good luck, keep your head up.