You had to get engaged to your fiancé's brother. Your fiancé is actually Adrian but because he slept with your best friend, so the engagement was replaced by his brother, Dave.

You and Dave are engaged but you have to. There is no bond of love between you two.You got engaged because your family didn't want to call off the engagement.

"I only had to get engaged to you because Adrian made trouble. Otherwise I wouldn't have gotten engaged to you." Dave said to you.