well it happened long enough ago that it hasn't effected your marriage up till now. Make up your mind if you want to stay married or not. If you are looking for a reason to leave then this is it. If you are still in love with your wife then talk it over with her and forget about it. When I say forget about it that is what you have to do. If you get into an argument over something do not bring this up. Every one is entitled to one mistake.