I knew he was a bit wary of labels and commitment, so I thought that maybe that was it. Both parties develop these rules with time together. When I'm into someone, I can't bear to even consider sleeping with anyone else, and finding out my partner doesn't feel the same way has been horrifying in the past.
Although Poly-Coach emphasizes that every poly or open relationship will be shaped by the people in that relationship. And, is there space? I appreciate that everything is on the up and up.