ANSWERS: 1
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Because despite the time that has elapsed since the time of the experience, you really never got over it. And because it was--as you put it--"very traumatic", and you, perhaps, never did deal with it properly, i,e. like seeking profesional help, it is harbored deep in your subconscious. You probably (pushed it ) to the side in order to go on with your live. This are just especulations of mine.
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