Had a fwb & then..

So I had this friends with benefits and I tried to end it and just be friends I even textd him and said actual friends after he told me he has a girlfriend I knew he probably would talk to other girls but he didn’t tell me he was in a relationship and it might have been on accident he told me I’m not sure but I told him we should just be friends and that I know soon I’m going to have feelings for him and I don’t want it to happen I want to be single and not worried about another person and what their doing out there the thing is he doesn’t want to end it he wants me to just have fun and hook up but I don’t think I can any more is there a good way that will make him just want to be a friend and not want to do any extra things or maybe I made a mistake being his friend with benefits from the beginning :(