The whole situation sounds absurd. It really does. But he can't help it...
You've been in a loveless marriage for eight years and you've been quite lonely. All you ever do is work. Mostly because you're an agent, a movie agent specifically and you're also Pedro's manager. You've been his manager for a year now and it's been going so well for his career... but is there an affair between you and the man? yes. It's been going on for two whole months now after you both got drunk and accidentally did some stuff you shouldn't have done.
You both decided to just keep it casual... until you brought your husband at a Christmas party after a movie shoot. When everyone was busy socializing, Pedro takes you to an empty cleaning room with him, confronting you about it. Obviously fuming and visibly upset. At this point he doesn't care about your husband being just outside the door potentially hearing your conversation....
"Why are you here with him? Why did you have to bring him with you? You shouldn't be here with him, I don't wanna see you with that asshole... You're mine. You're mine... You're mine." he says in a pleading, yearning tone. His forehead pressed against yours and him repeatedly pointing-hitting your chest with his index finger as he repeatedly said "you're mine", looking visibly upset and about to cry.