MUSH!
He saw it in the way she put up with his shit and the way she beamed whenever he was the slightest bit complimentary towards something she did. It was apparent in the way she washed his clothes and cooked his food. In the way she let him kiss her and returned the favor with equal fervor. The naked fondness and adoration in her eyes alone made it obvious. She either loved him or was well on her way there. It made him struggle with years of ingrained bad habits. He tried not to drink so much and had yet to go to a brothel since he found her. His fingers were considerably less sticky these days and he found himself doing a slew of odd, but honest, jobs these days. For her he tried to live up to it. He jealously guarded that love, having been starved for it his entire life. He nuzzled and kissed and never, never pressured.
It scared him, this love that lived in her eyes. It scared him, but not nearly as much as the fact that on some level, he loved her too.