To me the GF didn’t really look all that pissed, she looked more jealous and left out. But if I’m wrong and she was pissed, it was hopefully more towards the casting agent than him. He was actually cockgoing about it properly..doing so by following directions. The casting agent is to blame, not him. She basically fell in love with his cock which ended up making her overly possessive of him.
After the interview the girlfriend is super bitchy to him all the way home. Then she fucks him like a demon for the next week desperate to win him back. Then she cheats on him with any and every guy she can