The L word. It was not that he did not feel strongly about her- Will would obviously murder an entire city for her, even bring sure that she would come back to life. It was that deep down he knew that part of her feelings for him was because he understood and respected her. He could be what she wanted without having to discuss it. And there was nothing wrong with that, but he also knew that his connection to Hannibal would always be a problem.
His uncertainty about whether he wanted to kill the man or run away with him. It was still there, inside of him, no matter how strongly he felt for Yelena. It was also an expression of feeling that he wasn't comfortable with saying himself, much like a lot of his internalized feelings.
Hand grazing the line of her jaw and wrapping up into her hair, he returned the deepened kiss.
"I think you'll always be in my subconscious," he smirked. "I have a hard time forgetting things. And you never know, maybe you'll show up in my world. I never had a thing for blondes into now." Hand still in her hair, he kissed her again.
"I don't want to lose you," he whispered against her lips.