Cynic's corner

I will admit that the following verse by Dorothy Parker - she of the 'men don't make passes at girls who have glasses' fame (not true, girl!!) - is horribly cynical, but I also will acknowledge that it's brilliant - which is why it's here.
Read on, reader....

By the time you swear you're his,
Shivering and sighing,
And he vows his passion is Infinite, undying -
Lady, make a note of this:
One of you is lying.

Good, no?? I told you so...