Most Helpful Guy
Here's what you do: Relax! Really; this guys seems to really like you. Guys don't just go do nice things for someone because they're bored. And if he was only after sex, he would have done that stuff before, but probably would have stopped afterwards.
You're over-thinking things to the point of making yourself a nervous wreck, so stop! You don't have to "know" right away. Instead, why not just enjoy being with this guy, learning more about him and letting him learn more about you? It's not illegal; I promise. :-)
Just take a deep breath and be excited, because he sounds like a really good guy that's very interested in you. If he's already admitted he doesn't want to sleep with anyone else, then he's pretty much told you he is thinking of you as an exclusive partner.
Just have fun and enjoy your new boyfriend. :-)