So there’s this guy...

So there’s this guy I met 2-3 years ago. He likes me and I like him- we’re super close and we talk all the time. He wants me to be his girlfriend and I kinda feel the same but I feel like I’m not ready. We actually argue quite a lot though but when we’re not arguing we’re really close and I enjoy being around him. However he got really mad tonight because I won’t be his girlfriend and he said he’ll only continue to talk to me if we’re together. I don’t want to stop talking but I just get the feeling that I’m not ready now or even ever at this point. What can I say without making him even more upset with me???? 😭