Urgent need help

I'm in uni and there's a guy I had a class with, we kinda became friends? I'm now nearing the end of my second class with him, and as I got to know him I legit can't stand him. I figured he was into me and he's asked me to hangout a few times but I'd give a bs excuse like I didn't feel like it or I was tired. You'd think he'd get the message. Anyways, he recorded a song asking me out and texted it to me. I have to see him tomorrow and we still need to work on a presentation that we need to do in 3 days. What do I text back??? I've been very short borderline rude with him lately to try to give him the message that I don't even want to be friends but I don't want to sound like a complete jerk, that's why I never said anything before. PLEASE HELP I SEE HIM IN ONLY 8 HOURS