both are too heavy for them
 
 
2: Metal is ruined by Amy  
It’s doesn’t mean interpreting Amy in a nasty or naive way
 
 
Metal is a robot who can’t feel emotions, and Amy is a wonderful girl who considers love to be the highest value  
When she speaks of ‘love’ to Metal, he has to come to terms with a concept he can’t understand, but that clearly exists  
It’s too much for him. TOO HEAVY.
 
 
Even if Amy speaks and acts to Metal as she treats others, it could all be fatal to Metal’s circuitry
 
1: And this holds even when the position is reversed  
Metal is a robot who can’t know love; he can only imitate it, and that can come across as a kind of horror to Amy