Why so complicated?

I am 18 just so no one judges my decisions because of being underage because I'm not. 
 I have been talking to this guy for over a month and hanging out with him a lot lately and he wants to do sexual stuff all the time.
  The other day I asked him if we were ever going to be a thing and he said yes but he didn't want to rush anything. 
  Why are guys so complicated? Like why can't he just tell me he doesn't want a relationship so I don't get attached. I don't need false promises but he keeps giving them. He thinks that sexual stuff isn't rushing anything but a relationship is and that confuses me. Should I bring it up again, let it go, or move on?