how to get out of "relationship"? 😥

Hey! So my situation is the next: I started seeing my ex again a year after I broke up and having no contact to one another and as was to expect we couldnt resist our animal instincts and started making out a few times a week. It was all relaxed at the start and I still felt the freedom of not being in a real relationship but after a while i realised he wanted it to be more. I was honest at all times about what i wanted from the situation but I don't think he understands that I'd rather not see him again than be in a commited relationship again...