The school fight had just happened. Robby had pushed Miguel off the balcony, and then ran off. The only place he could think of to go to was your apartment.

Of course you let him in, not knowing what he did. But eventually, the cops turned up and took him to juvie

Robby thinks you snitched on where he was, but it was actually Daniel Larusso

He keeps declining your visits and calls, eventually you just stopped calling.