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LW does seem very brave and honest, and it's clear that she has many wonderful qualities. But that does not make her boyfriend an insecure little jerk. Mostly likely he just can't help how he feels about such a volatile issue. The truth is that none of us can really help how we feel. It seems to me that he must be very in love with her actually, and is genuinely caught between a rock and a hard place. I predict that if they do give each other a little space he will eventually come to terms with her past.
But it will always be a sore point. Science has shown that most men literally put women into Madonna/whore categories in their brains. And that this process is involuntary. That doesn't mean we have to go around judging people left and right. Just the ones we are planning to marry. It would be nice if feminist ideology stopped promoting the myth that it's every girl's divine right to kick up her heels and never be judged on it by anyone. Of course if a girl isn't interested in ever getting married, then that is a different story.
There is nothing equal about the mating game. Women give birth to the kids. Men don't. That's not equal, and it never will be.