Newman, Read a number of your posts. Your story reads very much like mine did before my wife and I got our marriage back. For me it was two years of making mistakes before I got it right. If I only knew then....
Couple of initial questions: Is the other man married? What support structure do you have (folks that know what's really going on)? Are your kids aware of the EA? How have the OM and your wife been communicating?
Additionally, other than her lack of "in love" feelings, would you say that you are doing and being everything she has always wanted in a husband? Would she agree (again, other than she isn't "in love" with you)?