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Biiiiiiig difference between one threesome and "an orgy phase." Really bad analogy. The girl did something ONCE. She's not an addict.
It's not the fact that the BF doesn't like threesomes that makes him a jerk. It's his systematic devaluation of his GF. Rather than keeping her around and treating her badly if he has a problem with her "morality," he should just be straight with her that he'll never be able to see her the same way again and let her go. Stop sadistically stringing her along and punishing her for being a whore (his opinion, not mine). THAT's the jerk part.