I'm not sure what your legal question is as this seems more like question to pose to a Doctor (i.e., is what the father of your children telling you a medical possibility?). I'm not sure whether him giving your an STD would or would not be a factor in any divorce of custody case, simply because more facts would be needed along those lines. If you intended to ask a legal question, my best advise is that you schedule a consult with an Orange/Westchester Family Law attorney.