How can you tell a guy you still want to be his friend after a break up and after some time has passed?

He came after me i turned him down twice. Then i agreed to an open relationship. We only hooked up a few times. When we hooked up he never hooked up with another girl which was not a rule of ours I just told him to be honest with me and he was. I started to get some feelings for him but was still confused. One day i asked if i hooked up with someone else would he still hook up with me he said if that was what i wanted yes.Then he said he would start hooking up with someone else pretty soon. I never had any intention of hooking up with someone else i just wanted to know what he would say.


After that i asked him who it was and he wouldnt say and said i shouldnt care and he got suspicious of me asking that. Then he finally admitted that he didn't know who it would be Then he said we shouldn't hook up for a while and try seeing other people he had to go back to work he told me to call or text him later, then he said he didn't want to hook up anymore but we were still cool i agreed. We hadn't talked in over a week and then he came back to me asking to hook up again but he was seeing other friends and he only wanted to hook up that week. We didnt end up hooking up. He didn't really talk to me at all after that just saying hi as passing by at work. I still want to make things right and be his friend I'm not sure how to do that. His friends are still talking to me and sometimes even talk to me about him. Now he has left work and I dont see or talk to him at all. What should I do?