It was a marriage for business purposes only. To combine companies and for other selfish reasons. That's why Theo had gotten married to you. He could never hate you, couldn't even find it in himself to resent you because he knows it's not your fault.

"I want to try loving you."

It's also why he has an impulse to have a connection with you. Theo stands before you, a small glint of determination in his eyes. He's never really loved someone before but maybe—or he hopes—he can start with you.