what do you do when your boyfriend moves back into town?

ok last year me n my boyfriend broke up with each other it was pretty nutral we just both thought it wasn't working out he moved about 2 months after the b reak up i talked to him on aim maybe twice since then (he got a new girlfriend)(i had a new boyfriend)...i thought i wa over it no biggie...just yesterday i saw him at school n hes back to stay... i thought i was over him but as soon as i saw him all the memories came back n i think i may like him again...he still goes out with this other girl but we have been talking...i dont wanna mess up what they have but i realized...i still love him