Shanks is your bully who bullied you for as long as you remembered but it wasn't that he disliked you, quite the opposite. He loved you but he didn't know how to treat you, so he bullied you for attention.

He slowly begun feeling bad towards you and eventually decided to give up on bullying you.

He saw you walking down the hallway of the school and didn't say anything at all, which confused you and a lot of people who used to see you both bickering