Analysis of Song From Amphitryon

Air Iris I love, and hourly I die,
But not for a lip, nor a languishing eye:
She's fickle and false, and there we agree,
For I am as false and as fickle as she.
We neither believe what either can say;
And, neither believing, we neither betray.
'Tis civil to swear, and say things of course;
We mean not the taking for better or worse.
When present, we love; when absent, agree:
I think not of Iris, nor Iris of me.
The legend of love no couple can find,
So easy to part, or so equally join'd.