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Thanks for the truthfully sarcastic answer

You are right, but how do I get it back without changing so much that she dumps me??
i.e. I stop texting/calling her everyday, she assumes I don't like her that much anymore and doesn't get the validation, doesn't feel that attracted to me anyway and so ends it.
or I start seeing other women or go on more nights out, she assumes I'm looking for someone else so ends it or worse does the same.
I'm 19 she's 17

Two words my friend, Inner game.
A) You give her attention when YOU want to.
b) You seek out other women because YOU do or do not want.
While your points ARE valid they are ALSO irrelevant. Part of inner game is realizing more than one viewpoint can be right but certain mindsets are more beneficial than others. In this case your NEED for her, your desire to keep
her at all costs is pushing her away. The tighter you squeeze, the less you have - in order to keep a girl around you also have to be willing to loose her too.