Yeah man, the feedback we provide will hopefully prevent you from fucking up in the future.
Don't be so hard on yourself. You made one mistake with one girl - just learn from it and don't do it again. Although, I think pheonix is correct in saying that this may happen again, and, I have a feeling it has happened in the past.
You shouldn't expect to find happiness solely in a romantic partner. That is really fucking unfair to that person, and, it's completely irrational to think another person is going to eradicate all your loneliness and unhappiness. That type of thinking has led many (idiot) men to threaten suicide upon a breakup, or generally act like a pseudo-romantic douchebag whose whole world revolves around some pathetic girl - don't be that guy, AnarchistRon.
As an "anarchist", shouldn't you be rejecting this type of cultural brainwashing?