Re (from dryad
"I think he really wants an answer to his question, 'Why aren't I enough for you?' But obviously it's not like that, it's not that black and white. How do you handle a question like that?"
I suggest something like: "It's not that there's anything lacking in you, it's just that I tend to fall in love with more than one person."
But it's true that he may never understand, no matter how good of an answer you give.