Ranch i feel what your are saying so much that i should have been the one to ask the question you did. My wife and i have been together since we were 14 yrs old and i have been the only guy she has messed with (her personal choice ~she has done a few girls though bcuz i wanted her to) she loves me to death and i love her to death.
She has even given me the chance to go have sex with other girls (any girl i want - especially if she knows i think they are hot ~ sometimes she plays the wingman/woman) we laugh and talk about the experiences after we get done; she used to also like watching me fucking the crap out of other girls bcuz she thinks it hot, however since we started having kids she has become super possessive of me.
now for the guilt part > she has no idea that i have banged a few hundred girls (here in the hobby), i feel like shit when i do it and its hard to face her afterwards (but the kink of strange and the rush i get from sneaking around keeps me doing it over and over ~ its like drugs) i really want to stop (really i have prayed about it) but i just cant seem to.
our sex together is way better than any provider i have ever been with but there are a few things she is not into in the bedroom (not open-minded) and worst yet she has no idea i occasionally like when a really sexy hot young girl pleasure me with a man toy (strap-on).
I really love her and would never want to our relationship to end but i cant stop.