I am terribly sorry your husband is cheating on you Paula. I know the pain of that as my husband cheated on me many years ago. I am not a PTSD sufferer though; I am a carer. We were separated for a time, then reconciled. However both of us needed to work diligently upon ourselves in order for the marriage to work, and it was not easy. Please do not put up with his cheating, especially since it the second time he has done so. Take care of yourself, you need to consider your own happiness.