Notice that the speaker uses the word “seldom” rather than “never.” “Seldom” means that true love is unlikely, but still leaves room for it to be plausible. This suggests that the speaker is trying to maintain her audience’s hope and innocence while communicating her experience of love.
The “Oh” that begins this poem creates a sarcastic tone. The speaker presumably speaks to a loved one who is weeping over a lost love. Rather than expressing sympathy, the speaker conveys to her audience her jaded perspective on love.
