My FwB's friend has been my friend for years. So like, we're all friends. Recently, he asked me out and he doesn't know that my FwB and I are doing what we're doing. My problem though is if my FwB would be okay with it. Should this be something I talk to him about (i.e. if he's okay with me and his friend doing it) or is it none of either guys' business whether I'm screwing both of them?