I know it hurts you that he is out with another woman, but it's nothing you can do about it. The best advice I can give you is don't ask him about her because all you will hear are lies. My husband told me the same thing, that they were just friends, however it came with benefits. You need to stop worrying about what he is doing and who he is with and focus on yourself. It will drive you crazy. I have been there. When your D is with your H, go out with some friends and have a good time. Do this for yourself.