OK, so you told a pretty rotten lie, but it was a little one which, if the girl had any sense, she could have verified herself quite easily. You clearly did it in order to keep her safe. OK, maybe you were a little foolish, but it was nothing. In the circumstances, she overreacted big-time, and if it takes a white lie to make her kick you out, what would she do if you were to make a more serious mistake?
I'm sure you do still think she's 'the one' just now, and that's to be expected. You're still in shock, I would imagine, finding it hard to believe what's happened. Everyone telling you she's not worth your love, you're better off without her etc etc isn't going to change your mind.
Can I suggest you give yourself a break. Find something to do, somewhere to go, some friends to be with, and promise yourself you won't contact her today. Then tomorrow, promise yourself you won't contact her for two days, until after Christmas, a month - you get the idea. One day at a time. I promise you, six weeks from now, you'll understand what they're all saying and you'll probably wonder why you were ever with her in the first place.