too attached too quickly

so I’ve talked to this guy a lot since may but then we didn’t talk for a bit, just started to talk again. we’ve hung out now 4 times and have made out and all that and I can see he is falling very quickly. currently I don’t have feelings for him but he was asking if we were dating and I told him no, obv in a very kind way, but how do I stop him from becoming even more attached? it seems wayyyyyyy too fast and I do not want to be in a relationship if feelings aren’t mutual. He is super nice tho, no bad qualities other than he seems to want a relationship like… right now. any tips?!