Not ready

So this guy I’m usually on and off with (friendship and crushing on wise) finally asked me to be his girlfriend and I said yes. I don’t really know why I did, I guess it was just the build up to it but I’m not ready for a relationship yet. I’m tied with school and work and keeping up a social life. Not even two days after being bf and gf he was like “you’re really hanging at a guys house?” I hung out with him before we started dating in usual groups. Idk how to say I’m not ready for a relationship without him blocking me like he did the first time. I’m so dumb we just started talking again after months and within that week we started dating. Can I have any tips???