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		 Usually it's just a feeling.  Most of the time one of the people decides it, and the other has to deal with it.  It's called a platonic friendship. 
 
You learn to get used to it happening.  When it does, just move on. 
		
		
		
		
		
			
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				If ignorance is bliss, you must be having an orgasm.
			 
		
		
		
		
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