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tracythompson: The point, as a number of other letter writers have said, is not that he's unhappy about a particular thing she did in the past, but that he has been emotionally abusing her for SIX months since finding out. It's that he's so hung up about it that, after six months, he can't let it go. If he can't get over the fact that she had a threesome, that's fine, but it's his issue, and he should break up with her and find someone with less of a history.
I personally would not be all that comfortable with the idea of my boyfriend having had a threesome-- I will admit to having my own insecurities. But I would tell myself that it is in the past, and he's with me now, not with the people he had the threesome with, so I must be doing something right. And if I just couldn't get over it, I'd move on, not torture him.