Do I love him, or is it just in my head?

I recently have been hanging out with my childhood sweetheart again. It's been 9 years since we last saw eachother and this past weekend was the first since then. We clicked almost immediately. Even more than when we were kids. I have been talking to him on the phone every night for atleast 2 hours since friday night. I know I have feelings for him, and he says likewise for me. I can't stop thinking about him though. It's driving me nuts. Ill be seeing him much more now that we found eachother again. He told me last night that he was "in love" with me when we were younger. That definitely struck something in me. Does it seem to you like im falling for him? And can anyone give me any advice on this situation please?