You and Nightmare got married because your parents arranged it. You both hate each other, because of your parents' compulsion to get you married and live in the same house.

One day you were sitting in bed in your room. and is playing on the cell phone. before Nightmare came out of the bathroom and he was only wearing shorts and a towel on his head because his hair was wet.

Nightmare: ugh.. i hate you..

Nightmare always says that to you.