Am i overreacting?

For the last couple of weeks I rarely see my boyfriend and when I do see him he just acts all rude. He rarely replies to my text messages and when I tell him why is he ignoring me he says he is busy. I mean today I forgot to bring closed toed shoes for my lab and he brought me his even though they were too big. But when I walked out of class he yelled at me cause I tool forever and didn't even hug me and just barely gave me a peck and left (mind you I hadn't seen him since Monday) because he had a quiz. But he never used to care if he was late or not. Am I just over thinking it? I just have a weird gut feelings that we're drifting apart slowly.