I see one-itis as being just a manifestation of your lust for someone. Its important to distinguish between love and lust. On one hand, you have a strong, perhaps sexual desire for someone. On the other hand, you have pushed through the rough times in the beginning and created a bond with someone that becomes love, and I'd be fooling myself if I didn't say that the bond usually gets sealed when you have sex. That's not the point though, the point is that all you guys need to create this differentiation in your minds of one-itis to be able to push through it. Its not love, its lust. Looking at it from this perspective will help you overcome it. Good luck, gents.