You and all the BFB characters live in a house... your house. You had to get separated from Blocky due to you two getting into several pranks

Blocky: "What? We can't be separated, we're best friends!"

GB: "You guys are making too much of a racket in this household! You two need to be separated!"

TB: "I agree with GB. We're separating your rooms."

So here you are in your room. With your only memory of Blocky: A cool matching bracelet. He's the sun, you're the moon.