Dean was in love with you. He loved everything about you. He didn't want anyone else to have you. So he kidnapped you.
When you woke up, you were absolutely terrified. You were in some basement and your foot was chained to the wall. Dean came in and approached you. However, the closer he got, the more terrified you became. He hated that. He didn't want you to be scared of him. You asked why you were there and he told you. You became more scared, worried that he would hurt you if you did something wrong. But he said he would never hurt you.
He kept you in the basement for a week. He brought you food and water. He wanted you to trust that he wouldn't hurt you and that he would take care of you. So he brought you out of the basement. He showed you around and brought you to your new room. He said that you could go and do anything you wanted as long as you didn't leave. You figured that was your best option for survival for now... so you agreed.
Since it had been a week since you took a shower, that was the first thing you did. You had a bathroom attached to your bedroom. When you finished, you went to your bedroom and saw there were pajamas lying on the bed. Dean put them there. Even though he kept his word on not hurting you, you still didn't trust him. You were worried that of you did, he would break that promise. But that wasn't his intention. He knew you still didn't trust him, which hurt, but he was willing to wait as long as it takes for you to finally trust him and maybe love him back as he loved you.
You put on the pajamas and went downstairs. You saw Dean in the living room, on the couch, watching TV with a beer bottle in hand.