If you continue you current relationship, you'll probably have the original girl in the back of your mind. The fact that you're questioning things right now suggests that you'd rather be with the old flame than the new one.
But... just because you have feelings doesn't mean there's anything solid there. I'd becareful, especially if you have someone right now that you haven't been 'on again, off again' for over 3 years.
I can't make this decision for you, and I don't think I've pointed you in any directions... don't you just love Love?
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