How do i talk to him again?

the reason you were friends b4 is bcos you have things in common and get on well you have to put woteva it is that keeps getting in the way of this to one side and concentrate on getting the communication between you stronger. communication is one of the most important thing in any relationship next to trust that is! watch a film then discuss it, recount some of the memories you shared as friends, that should get good convo under way!