Harold continues to entertain.
Even if he was just a teenager, he doesn't come out well in this version of events. She was his father's entry-level employee; he gave her a stuffed Miss Piggy that he'd just won somewhere as a birthday present; he saw that she was upset at her ex turning up to her party with his new girlfriend so he buys her a load of shots, suggests they go outside for a smoke, initiates a quickie with her and then buggers off and never acknowledges her again. What a charmer.