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You have left..
The wife is talking about how her husband has left to go down the river and starts to describe the setting to give off this sadden feeling that she upset that he is leaving and doesn't want him too. -
Let me know when you come back.
The wife starts to say in lines 27 that once the husband comes back she wants to know that way she can wait for him by the river to see him. She says that she will meet him at a beach down the stream.