Rekindled first love driving me crazy. What is he thinking?

He probably felt something as you did and maybe it scared him a little. He probably wanted to be with you and that's why he texted and called you but then realized he had a girlfriend already and he couldn't just drop everything and change his life to be with you again. He must have felt something again to dance with you like that but you can't really be sure unless you take the first step and ask him what he's thinking. Maybe he didn't realize the feelings he was going to have for you again and decided to stop talking with you before things got out of hand. But whatever the reason, I do think he felt something again for you, but know you need to figure out what. Good luck with everything.