He knew, deep down, that he was unlovable.
Not because he was abusive or anything, he kept up an outer shell of being an average guy, and the inner core of that wasn’t a serial killer or a rapist or anything evil.
But the inner core of his being? It was selfish and uncaring, no matter how much he tried, he just couldn’t bring himself to care about anyone other than himself, to love anyone other than himself. And if he couldn’t give love, he knew that he couldn’t receive love.
No matter how many times she lied to him.