It’s not necessarily fiction. I knew a guy in my bi group in NC in the early 90’s who spoke so much like this guy writes, except he was bi and wanting to date guys on the side, but his girlfriend, maybe fiance--I can’t remember, was very straight and not interested in an open relationship, or so he thought. He brought her to the group to learn about us bisexuals. Then they were gone for a while, and when he came back he was sputtering angry that his girlfriend was going out with women and that sooo wasn’t his plan! It was pretty hilarious and great.