I'm sorry she betrayed you this way.
If you are committed, and she is as well, only time will tell. Its good of you both to have had therapy--that is the best source of help. However, you may also want to experiment with your own ways of healing to sort things out. Would writing in a journal help? More family time together? Prayer?
People say "time will heal" and its true... But that also means no one has the golden answer for you. Only you and your wife will ever know if its a marriage worth keeping or not. Only you will be able to find the right path to help yourself get over it. Time heals because eventually we all find answers or at least find forgiveness and peace.
Good luck to you. I admire anyone who will take the steps you have to save your marriage.