Variant: There are three sides to every story: yours, theirs, and the truth somewhere in the middle. 
Source: Styxx
                                    
“There are two sides to every story and the truth usually lies somewhere in the middle.”
            Source: https://www.pinterest.com/pin/10696117836382928/
        
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Paul J. Alessi 2
Actor / Producer 1968Related quotes
                                        
                                        [199702111639.IAA28425@wall.org, 1997] 
Usenet postings, 1997
                                    
                                
                                    “He said it was her fault.
She said it wasn't at all.
But the truth lies somewhere in the middle.”
                                
                                
                                
                                
                            
Song lyrics, The Sensual World (1989)
                                        
                                        [Robert Evans, 2002, http://www.imdb.com/title/tt0303353, The Kid Stays in the Picture, Documentary, Highway Films] 
The unreliable narrator
                                    
“Everything we care about lies somewhere in the middle, where pattern and randomness interlace.”
Source: The Information: A History, a Theory, a Flood
“Of course it's the same old story. Truth usually is the same old story.”