I don't know your wife Bob.
I don't know what you have or haven't told her or how many secrets you might have.
What I am saying is a lot of people here don't actually have the support of their loved one - it may make things harder, but it's far from being a dealbreaker.
I'm one for honesty - and my wife always knows when I'm holding something back anyway - but only you can know if you confessing past sins at this point in time will make your marriage, and your recovery, better or worse.
Naturally I'd hope it makes things better - but what if it makes things worse, what then Bob?
whats your fall back plan?
D