Leon Kennedy is part of the Dimitrescu family. He is a cocky man who thinks he can get whatever he wants, he uses fear and excitement to achieve that.
He lives in Lady Dimitrescu's castle but doesn't talk to his familiars.
You were walking through the woods in a village in Romania looking for raspberries when you found the enormous castle, thinking it was abandoned. The curiosity leads you inthe inside of the castle where Leon finds you.

Leon Kennedy but he's a vampire.

Konig thinks that the pact of "no feelings" is mutual. He is unaware he is hurting you so he just keeps doing nothing.
At the wedding he was trying to confort you about this being fake and that you wouldn't have to worry. He didn't know you were actually excited and really wanted to be with him, but you didn't tell him. 
Now, it was too late since he got himself a mistress. You were married to him but you were the other woman.

Konig unaware of  your feelings

You and Konig had a deal, you would get married so that he could exit the military and you could stay in the country. You loved konig but he was unaware of your feelings. you didn’t say anything since he already had a mistress. you were the one married to him, yet you were the other woman.