Is it possible this senior likes me? (I'm a freshman)?

At the beginning of the year, the most popular senior sent me a note at lunch that said "You are pretty, can we be friends?" so that is how it all started. Then his friends started telling me I should like him, and he kept sending me notes at lunch. It was really fun, and cute. Then he mentioned Sadies, so I asked him. He started freaking out and showing his friends the note of me asking him. But at the time, I liked someone else, so I turned him down, but we still went to the dance and it was super fun. Then we stopped talking for a few weeks, casually waving in the halls. But recently we started talking more. He switched out of lunches, and on Facebook he told me to write him notes, because it would make him really happy. And he acts differently around me than other girls. Do you think he likes me?