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I told her that all the other girls was me keeping my options open, trying to find the one special girl, my soulmate (jazz it up however you like)- but when you find this one person then all those other girls will be out of the picture. Around the same time your saying this say something that hints that she has a good chance of being that special girl.
Yeah this is good. Say you're open to commitment in the future but you need to get to know someone first. If that future girl has the right qualities, then you're totally willing to just be with her. Then you can talk about what those qualities are, and boom, she's qualifying herself to you and will be actively trying to do those things to keep you. Welcome to the world of qualification and compliance

Now you just give her a few honest compliments about those things about her personality that you like, do a bit of comfort building, and you're golden.