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					Originally Posted by  FLAME ENVY
					 
				 
				There are vertical separation rules for all IFR aircraft which is 1000' below FL290 and 2000' above FL290. 
			
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Just had to poke fun that this changed a number of years ago....it's 1000' separation all the way up to FL410....or maybe higher,I don't know, I don't get up there 
And for the OP, as Metro says, having another plane pass by just 1000' away seems quite close, but is totally normal. The turn you had before was likely just a coincidence.