Is my boyfriend cheating on me?

So my boyfriend has evening classes for his apprenticeship and occasionally he gets good before he goes to class. He told me he was getting food at Sonny’s and I’m thinking he’s with his brother cause whenever he’s with his brother or with family he doesn’t really respond til he’s done eating which I completely understand. Today in the afternoon he tells me he’s going to Sonny’s with his brother and I’m like y’all went yesterday and he’s like well I did he didn’t he has class on tuesdays and Thursday’s. And I’m thinking who were you with then cause usually he’d tell me who he’s with at the time. And I said well it’s weird that you were by yourself at Sonny’s and I didn’t get any replies for an hour later so you were with someone. Then 4 hours later he replies and he’s like I don’t think I have to explain myself for getting food, I was there and a classmate ate with me. And then he’s getting pissed off and saying I’m insecure and crap and I just wanted to know like a normal girlfriend who you were with because if it wasn’t his brother I wanted to know who it was. Now I’m asking is he cheating on me?