I have to agree with Lee.. But now you need to think about these children and what's best for them. The LAST thing they need is their worlds turned upsisde down with a divorce and finding out that their "dad" is not their real dad. This woman needs to know your medical backgraound in case there is a need for it in the future, but other than that you have no right breaking up this family. It's similar to an adoption. You need to walk away and let HER deal with her infidelity. You both were/are in the wrong but why should the children suffer for your supidity?