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Couldn't believe how hard Cary came down on a guy who seems essentially shy and rather uptight about sex. Maybe the thought of a threesome is just too far outside his moral territory. Didn't she notice up to now that he's sexually conservative (and she isn't)?
I think this whole episode was a blessing in disguise. Sooner or later, the deep basic differences in their core values (which always include sex) would have torn them apart. Better it should happen now, rather than five years down the road with two little kids wide open to the emotional damage of a messy, hurtful breakup.