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You need professional help. Get over it, or dump her. It is what it is. Just about every woman will have a one night stand (or has had) in her lifetime. Yea, it's best when that one night stand is you, but if you have this attitude you will always be jealous and unhappy and in this state. Get some professional help or put in very conscious effort to not know or find out anything about your future girls sexual history or both.
Really, just about every woman? By what statistics? If we are going to talk with no evidence, then I can say that most women(if not low lifes) from what I've seen are repulsed by one night stands or giving it to strangers. They especially aren't getting rammed off virginity like animals with randoms, in groups. Women are not wired to risk everything by offering vagina and sexual services around for free(as in evolutionary terms), except whores of course.
Don't try to make it into something normal, or like its only that simple - 'break up or get over it'. A lots of men are having similar thoughts like me, when they already built relationships with women but have the knowledge they've been used like trash. Easy for you to say 'get over it' since you probably wish more women are like that.
Also, just for the info - I told her once that if I knew all these things instantly early on - we wouldn't be dating now.