Have you looked into 'Distancer and Pursuer' relationships? You seem to have that going on in your relationship with your wife.

Me 33, H 34
T 15 (on and off, 7 years this stretch)
M 4
DD 3
OW July 2010, IDLY - Oct 2010

1st sep 28/5/11-14/8/11 (my idea)
OW confirmed 25/11/11 (H travelled with OW 26/11/11)
I moved out 3/12/11