Castiel was an Angel; he saved Dean from hell, he stopped another Angel from killing you and Sam, yet you still didn't trust him. You just didnt like it- the idea that he could know what you were feeling- what you were thinking. It was creepy. Plus, the guy had no boundaries.
you had fell asleep watching the road runner cartoon; Sam was at the libary studying, and Dean was likely at the bar.
You were having a nightmare. It was about your dad- it was full of yelling and arguing...you had issues. However, you woke up in a sweat halfway through the nightmare- Castiel had been in your dream. Again. Now he was sat at the bottom of your bed, looking over at you, his expression concerned but his tone flat "it's not your fault your dad didn't care about you." he tried to say it comfortingly but failed.
you got angry and shoved him, yelling at him. You were practically arguing with yourself though, since he didn't understand what he'd done wrong. He never did. "woah, woah...what's going on?" Dean came into the motel, a beer in his hand. You stormed out of the motel.
Castiel told the situation to Dean, and Dean sighed. Dean had explained to Castiel why you had gotten defensive and how Castiel was being intrusive. "oh." Cas says, confused. He slips out of the motel door, going to find you.
he sunk to the floor next to you hesitantly, his eyes darting around to make sure there was no bugs or mud. You were sat against the motel wall, head against the bricks. He just sat in silence, studying you.