Originally Posted by NeonKaos
Unlike the other responses here, I don't see egregious disrespect or "cheating", I see two people in a relationship who are not on the same page.
I see it largely like this, as well. However, it does seem she should be more considerate of his feelings and needs than she had been. Then again, I think he needs to honor his feelings/needs enough to express them in current time. And by "current time," I mean each of them need to renew their discussion about opening up their relationship ... and be current with one another on this mutual process of exploration.
It sounded to me like they had talked about and read about non-monogamy, but had come to little or no mutual agreements.