She’s pretty tolerant of her boyfriend flirting with other girls because he’s proven time and again that he only has eyes for her. The only thing that bothers her is when women continue to flirt with him after he tells them that he has a girlfriend.
He doesn’t mind if she flirts with other guys either. When they go out they compete to see who can get more numbers.
Tonight he’s gotten more numbers so she needs to catch up.
She starts chatting up a random guy and doesn’t notice when he slips something in her drink.