Yes that's true..however it's a statement based on the well know principle of something not being productive if the dynamics are completely wrong...that's just an equation of life.Its like saying if you have a suit that's the wrong size it wont fit properly without knowing just how it feels to have a suit on that's the wrong size.I agree with this 100%.
what he said is not born out of actually experiencing the hurts and traumas associated with a relationship breaking down.There's no real life point of reference.There's no experience of getting over someone you deeply loved who has deeply wounded you..there's no taste of the emotional rawness of betrayal....of crying over the end of a bad relationship one just had to walk away from.
He has no real life point of reference to know how it feels to be in a bad relationship.