[Just a thought. He actually does smile at her reaction, small as his smiles always are (the fact she can bring them out at all is impressive). He thinks anyone would be hard pressed not to smile at the face Aubrey is making, though (the blush included).]

I'm not asking you to marry me.

Only saying. Back when I was in the Survey Corps, you'd have been someone worth fighting for - something to come home to.

It's a compliment.