I agree that making one's needs known is important.
I'm concerned, though, that the man didn't even *ask* about whether she wanted company. I can't conceive of any relationship being considered serious with such an obvious lack of concern (or so it appears to me). That speaks to an underlying assumption that she's simply an accessory to his "real life" and not an integral part of his life.
Or I could just be cranky. Seriously. There are folks who post stories on here who tolerate a great deal more nonsense from others than I would (these days, anyway) and I have difficulty understanding why they'd want to continue on in their relationships without some serious, immediate changes. I figure I likely sound horribly cantankerous to some readers because of that.
When speaking of various forms of non-monogamy...it ain't poly if you're just fucking around.
While polyamory, open relationships, and swinging are all distinctly different approaches to non-monogamy, they are not mutually exlusive. Folks can, and some do, engage in more than one of them at a time--and it's all good.