True Affection
The Thanos-Gamora relationship is quite complex, to say the very least. After he kidnapped her as a child, Thanos raised Gamora to become the mighty warrior she was. However, even though he acted as her adoptive father, deep down, she never let him off the hook for abusing her. After all, he did destroy half her planet.
But Thanos’ affection for Gamora is genuine. He really does take her opinions to heart. A perfect example of this is when Thanos makes notedly sits below his chair instead of on it. The reason? Gamora told her that she always despised that chair, and he makes sure not to sit in it to please his adoptive daughter.