| Quote #7
Martha: Now you pay attention to me! […] I swear to God I'll follow that guy into the kitchen, and then I'll take him upstairs, and…(2.805)
Martha makes a big deal of her threat to sleep with Nick, which would seem to indicate that she's never actually cheated of George before. The threat would have no power if it were a regular occurrence.
| Quote #8
Martha: I pass my life in crummy,[…] would-be infidelities. (3.31)
Martha seems to be admitting here that her previous flirtations never went farther than that. She laments the emptiness of the whole game.
| Quote #9
Martha: That's right, lunkhead; answer the door. […] or are you too drunk to do that, too? Can't get the latch up, either? (3.73)
Since Nick failed to perform in the bedroom, he has lost all status in his relationship with Martha.