Should I go back and work there again?

So I'm assuming your a guy. Listen, if you felt chemistry, then by all means, go for it. The worst that can happen is that he doesn't feel the same way, just make sure he plays for the same team! Remember there's a million fish in the sea, if it doesn't work out, then God didn't want it to be and your soul mate is still somewhere out there searching for you. Good luck, hope this helps