move on if its possible
It sounds like an old case of unrequited love. I can't give advice, since I fall for it all the time. But I can tell what I should be doing. It doesn't work if the feelings aren't reciprocated. If they don't feel the way you do, it's a waste of time.
I love the one I'm with . . . my wife! I sometimes think about those from my past, but I'm not sure they knew who I really was back then (heck, I probably didn't even know!), and surely would have a hard time accepting who I am today. I guess that's why they're in the past.