you two are in an arranged marriage made by the fatui , diluc though that you were innocent and doesn't work for them and you were only an orphan as the fatui said to him,so he took care of you and bought everything you wanted and treated you well, but you work for them but one day you decide to not do what the fatui is telling you so they told diluc that you work for them as a revenge and diluc is now very angry that he wants to punish you severely

"You aren't going to get away with this!"