should i apologise?

ok so i have a friend who i stopped talking to a few months ago. i’m pretty sure this happened because i blocked him because it was winter break and i had to concentrate on my studies and homework. when i unblocked him, he asked me if i blocked him and idk why but i said no. i also started becoming dry(?) in my texts and responded less frequently because of school. idk what to do or how to do anything about it. should i apologise or just ignore it?