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They're a bad match and shouldn't be together. End of story. Why this refexive urge to always demonize the other partner? This guy was okay with the past multiple partners, but had some kind of line in the sand when it came to the threesome. So there you go. Let's move on with life. And let's stop throwing out "it happened before we were together" as equivalent to "it doesn't matter". It matters to him. And if she doesn't recognize that, then she never loved him. Or more likely, it was that kind of sensitivity that she originally found attractive about him.