My bf doesn't understand hints

For the past week he's been acting really weird. He started university & is working as an RA in the dorms. He says he's always busy.. Well he hasn't been really texting me for the past couple of days, I try to be cute with him but he'll just ignore the messages. Today I had it with him and told him " I don't think you really care about anymore" & all he said was "why? What's wrong?" I told him that's what's wrong, then he said he was going out to icecream with friends and never responded.. Should I just leave him? I've never been with anyone that doesn't care about me/isn't clingy with me