I (18f) broke up with my (18m) boyfriend 3 weeks ago, but he's still buying me food and helping me work out- what the hell is going on?

We dated for almost a year, and I considered him the love of my life. I broke up with him 3 weeks ago, because of a disagreement we had about his roommate's gf (I don't really want to go into detail, because it's a pretty weird story). After I broke up with him, he kept begging for a second chance, and insisted that we'd still see each other a lot because we go to the same college, and I said fine. We've been spending a lot of time together since the breakup, and he's still doing things like buying me starbucks and making my protein shakes for me. We've also been working out together a lot, and he still keeps giving me advise and helping me out with lifting (he's a powerlifter). He even went as far as to say that I'm the most important person in his life- what the fuck? He seemed pretty angry when I first broke up with him, and now he's back to telling me he loves me and wants to be with me. I know he was planning on staying in the same apartment with his roommate next year, so it would be a big pain in the ass for him if we got back together. I really like this new single life tbh, and I'm thriving as a baby bachelorette. What do I tell him now? I would rather not have to talk to him at all, because he's really irritating me. I'm going to try to stay with my sister over winter break and I'm really psyched for that, but I don't think he'll stop texting me. Should I just ignore him?