Purposefully destroying your marriage(100% sure she'll leave) and family to "salve your conscience" seems like you want out of the marriage to me and this is your "noble" way of getting out. Sorry to be so blunt, I listen to too much Dr Laura.
Go to the Lord in prayer, ask him to forgive you, and reveal to you your next step. Why not channel your guilt into being an incredible husband? Why not each time you feel bad do something nice for her, do the dishes, change a diaper, when your kids have left home, if you feel like your temple marriage is still worth nuking over a few kisses 15 years prior, then by all means go ahead, but don't destroy your kids childhood's because your wife is currently to immature to forgive and you know it!