When is it "O.K." to lie to someone?

I don't want to be mean but this marriage isn't working. If you want to stay married to her, then you two will have to seek counseling and find ways to trust again. However, you will never trust her again after learning about the constant cheating and lying. As the saying goes, once a cheater always a cheater. Do you plan on lying there every night thinking who she has been with and what diseases did she catch to p them on to you? Save your sanity and work on taking care of your kids instead. Show them that their father is there for them regardless of what goes on with you and your wife. Don't let them suffer.