Perhaps he loves her more than he should... but he has no regrets about it. He's an adult; he very much likes to think he knows what he's doing. Bill knows that thoughts of Fleur -- the very idea of Fleur -- kept him alive and sane during his months of captivity. If it weren't for her, he might already be gone.

Or mad, like Ophelia.

He looks into the great oceans of her eyes, lost. A small and selfish part of him wishes she would just use her Veela charm, make him forget his thoughts, but he knows she won't.

He speaks, finally, in a very small voice. "I am yours. I love you, and for me there is no other. The question remains: do you love Ophelia?"

He has to know.