During a basketball game you cheered on your friend (boy) and jonathan got jealous. when the game was over, you shook your friend's hand, and jonathan who was next to your friend was jealous. when you came back home jonathan held your wrist and said

"uh..sorry..i want to tell you something..can you meet me tomorrow at the school canteen?"

it's obvious that he wants to ask if you have a relationship with your friend.