If "her" is a set of keys, then yes, it's inevitable.
If "her" is just a plain old girl, then I figure you could probably keep track of her, as one type of relationship, you might. Those things always change. But as a person, she should be pretty easy to keep track of. Will that be enough for you? To me it's enough just to simply not lose a person like a set of keys.
If they were keys, I wouldn't care what kind of locks they opened. Get it?

good luck. No matter what happens it'll be ok. : )