Thorin had believed himself to be very clear about his intentions. He offered to help you train, he would set his bedroll close to yours and he even offered you his coat when the night got cold.

Thorin was courting you in all of the traditional dwarven ways. You were just a bit oblivious, believing his actions to be the same as any of the Company members who had taken good care of you throughout the journey.

You sat the fire alone when Thorin sat down behind you and began to braid your hair.