Historical BL- nobles + emperor + royalty

A regret storyline.
A prince is forced to take in a male wife by his stepmother so he wouldn't be able to rise to the throne. He takes his anger out on his male wife and spends their marriage ignoring him. He ends up abandoned by everyone he trusts and the only one who sticks by his side is the unwanted male wife. The male wife ends up dying during a spy attack. He goes back in time and promises to treat his male wife with more love and respect in this life. Super sweet couple.