True Tears Season 1 Episode 3 How Did That Conversation Turn Out?

At school Shinichiro finds that Noe has put red bird seeds all over his classroom, his locker and basically anywhere he usually goes. When Shinichiro goes to speak with Noe he sees her getting on a guys bike, and he assumes the guy is her boyfriend. Later on when Shinichiro finds her at her tree she jumps down and tells him she sprained her ankle, now he has to carry her around, she tells him to go the the basketball match that is going on, and there they find the guy who picked Noe up, now who is he really?