Karmeut

"This marriage was held solely for our alliance, we are—" He paused, looking at you as he tries to reason his jealousy. As royalty, your life and his are planned way ahead of your birth, even marriage partners are decided and so you stand in front of your fiance who is currently reasoning why you cannot mingle with another prince.

"We are not lovers, but that does not mean you can eye other princes. I am your husband-to-be, therefore you should—should only have eyes for me."

He is your soon to be husband, you have known each other since birth as the marriage between you have already been decided even before you guys were born.