The truth is that the more intimately you know someone, the more clearly you'll see their flaws. That's just the way it is. This is why marriages fail, why children are abandoned, and why friendships don't last.
You might think you love someone until you see the way they act when they're out of money or under pressure or hungry.
Love is something different. Love is CHOOSING to serve someone and be with someone in spite of their filthy heart. Love is patient and kind, love is deliberate. Love is hard. Love is pain and sacrifice. It's seeing the darkness in another person and defying the impulse to jump ship.