[At first it doesn't register that she just paid for them; he's distracted talking to her, and then he's just waiting for the cashier to ask him for his card too, lingering with her by the counter.]

Yeah, 'til I made myself sick, right? They probably wouldn't appreciate that! Sooo I'll just have to come back, like you said . . . you offering me company?

[Then it occurs to him.]

—Did you pay for mine too just now?