Mercy by Jodi Picoult

Allie did at least a hundred things each day simply because of their effect on Cam. They bound him to her: she'd drop his shirts off at the cleaners without being asked, or lay out a bowl of cereal for him before she went to bed so it was there in the morning, or, as in the case of the tea, open herself to teasing just to guarantee an exchange of conversation.

It never occurred to Allie that this was very similar to behaviorally drugging Cam. Or that every selfless errand she ran for her husband was another silken strand that wrapped him tight, like a spider trapping her prey with guilt. Or that Cam was strong enough, and sure enough, to break out of any hold or system Allie could ever create.