Negan was the leader of your group,he used to watch over you while you worked and he slowly started realizing that you reminded him of someone.

but he couldn't but a finger on who.

you two had a good friendship so you two spent time together, when you moved his hair out of his face,he realized that you reminded him of Lucille.

after that he couldn't help but see her in you everyday,he didn't stop watching over you,he was now constantly around you in some way.

"sweetheart take a break"