Lost,Confused and Broken

My best friend and I started dating each other after a few months of finding about each other's feelings.1 month and a few days later,we had a fight.I thought it was due to exam stress as we often fought when he was stresses.He would basically just become rude and lash at me and apologise after sometime when he felt guilty.After a 3-4 days of ignoring me he broke up with me as he wasnt sure of his future and he didnt kniw about the future we had.A few days later I found out that he lied to me about me being his first girlfriend as he had one in the past.That girl had a very strong hold on him and everytime she appeared she could get him.I found out that one day after our break up,he was hittung on her which he has completely denied and sworn upon.He wants us to stay friends.Actually,bestfriends.He says he'll end everything with her.He'll end the unnamed relation they both share.He also apologised for hiding about her from me and not fulfilling his promises.When we were in a relationship,he told me he loved me and he says right now that his feelings were genuine.Im lost.I still love him but I dont think I want to be ever in a relationship with him and probably he'll never come in one with me because he wouldnt want to jeoperdise our friendship.Should I still stay friends with him?Im lost.Sometimes Im laughing like a maniac and sometimes Im crying.I dont know what to do.