Catching feelings..

I don't know if they ever left but seems as if I'm starting to feel a certain way about a certain somebody that was in my life a while back, I'm not trying to rekindle old flames but when we talk we still clique like how we use to before we actually became "committed" to one another. Maybe I'm confused? I don't wanna get to caught up in trying to be friends with this person because I know that would NOT work out for the better it was attempted before and it wasn't a walk in the park. I'm lost on the situation don't know how to feel ...HELP!