What we want to find is the denominator common to all of your failed relationships, but absent from the successful relationships that other people have (the presumed question being "why do all my relationships fail, but Alice, Bob, Carol, etc. have successful ones?"). Oxygen doesn't fit the bill.
"You are the only common denominator in all of your failed relationships." != "Why do all my relationships fail?"
Both you and others have relationships, both "failed" and "not-failed" (for some value of failed). The statement "You are the only common denominator in all of your failed relationships" is clearly false, even if comparing to others who have successful ones in search of differentiating factors. The "only" is the problem even then.
Another month has passed and here is a new rationality quotes thread. The usual rules are: