What’s the relationship between the two speakers?

W: How many times shall I tell you? Put ashes in the ashtray, not in a glass.
M: Sorry.
W: And the newspapers. Look! You scatter them everywhere.
M: I’m sorry.
W: How much longer do you plan to watch TV? Don’t you have anything else to do?
M: Will you stop nagging?
W: What? You know what you are? You are a lazy bone. You’re a born loser. If you’d ever listened to me, we wouldn’t be living in this rotten place. You...
M: That’s enough. Don’t go too far. I don’t want to have words with you.
W: That’s because you’re a coward.
M: Shut up. Why do you have to be like this? Don’t annoy me.
W: You can’t be annoyed. You don’t have the guts. Do you know how much Karen’s husband makes? Thirty thousand a year. How much do you make?
M: That’s because you spend too much, you want too much, and you nag too much. You’ll be much more better off if you’re content with the life you have now.
W: How can you say that to me? I’m not the one to be blamed. You are.
M: You’re unreasonable.... Where are you going?
W: Out! I’ll spend the night at Karen’s place.
M: But how about dinner?
W: That’s not my business.