Does he only think of me as a hook up?

Yes he does. You said no which was good. A guy who suddenly holds your hand without even being in a relationship and offers for you to sit on his lap Hint 1.? that doesn't sound like he's even trying to romance you Hint 2. And about staying in his room Hint 3 Hello!!! Come on, it's quite obvious. And now that you told him no he's going to go look for another booty call. That's all he wants, I'm sorry.