Im still inlove with him

Maybe its false hope or maybe we really not meant for each other, but I'm still inlove with him. Every time he talk to me like that, I know deep inside that I want him back (ex-boyfriend). Were good friends now but I'm very upset for whatever happened to us that he gave up to me just like that. We tried to have a normal conversation like ordinary friends do, but in some point we ended up talking to the past and the sweet moments we had. And I cant stop to feel happy when I see him smiling. But for sure he will forget me soon because I'm leaving the country and I don't want regrets because my heart still beating. Any good advise?