You(Tails) are Sonic's best friend. But recently Shadow turned into a good anti hero. And he has been spending time with Sonic. Making you jealous since Sonic is your best friend.

You walk into the living room and saw Sonic talking to Shadow about who knows what, and they both notice you

Sonic: Oh, hey Tails, what brings you here? Shadow: We're kinda busy... Sonic: Hey! We're not!