This is quite a pickle! First off, I'm sorry to hear that you are going through a hard time with your husband. Be it true or not, it is always best to resolve the matters with just the two of you. Even if he may have brought a third party into the mix, the fact of the matter is, the TWO of you are the ones bound through marriage. That said, try to work together amicably and get to the bottom of it together. It may be difficult to open up your little can of worms but if it's to clean it out, it will all be worth it!