Thinking he's got a sure thing is a running theme with Russ. In his book, he had this elaborate fantasy about what would happen when Taylor got his song. He thought it was just a matter of time. Whenever he does anything, he's convinced it will succeed despite all evidence to the contrary. Then when it inevitably blows up because it's either unrealistic or poorly planned, he goes ballistic because he's been thwarted. It's never him or his plans that are at fault, it's always someone else who ruined everything. Agents, bias judges, aliens from Zeta Reticuli, it doesn't matter, it's never ever because Russ is delusional and lets his fantasies ruin his life. I think this is what caused the Erika situation. Pretty girl talks to him and expresses an interest in being friends (just friends, she was clear about that), and Russ starts planning the honeymoon. Then when she got uncomfortable and tried to set some boundaries, Russ, as always got mad she wasn't following the script he'd written for her and started stalking her. Previously, his inability to distinguish fantasy from reality just resulted in him making an utter fool of himself and ruining his career prospects. Now he's at risk of having a criminal record (yeah, I know he technically has one now, but if he somehow goes a year without breaking the agreement, it gets dismissed, so that's why I put it like that), and since he can never, ever let anything go and admit defeat, I think he'll fuck something up and end up not getting a slap on the wrist.