Pain.

I’m not sure of your full story with this girl, but like any addiction, I think the only way to get past this cycle you keep repeating, is to go longer and longer without needing to talk to her. No matter what the addiction, people can go for a couple of days, and then they hit that wall. They need that thing they miss. Their minds tell them they can’t possible push past this. This is a dead end and you must turn around and go back. But it isn’t true. That wall you hit is actually the key point to getting better. People don’t realize it. If you stay strong and get past that point, you can keep on going. Or even if you fail again, at least you can say you made it a little bit further than the last time you tried. Too many of us lack the will power or are conditioned that as soon as something gets uncomfortable, it is time to quit. But those uncomfortable moments are actually the key change. If, only if, you really mean it when you say you are tired of needing this person, then next time, fight past the uncomfortable moment. Leave her alone for a few days, and when you get to that point where you feel like you need her again, just try to get past it.