On Waterloo Bridge, where we said our goodbyes,
The weather conditions bring tears to my eyes.
I wipe them away with a black woolly glove
And try not to notice I've fallen in love.
On Waterloo Bridge I am trying to think:
This is nothing. you're high on the charm and the drink.
But the juke-box inside me is playing a song
This line establishes the dilemma of the speaker. She understates her feelings, trying ‘not to notice’, and we can only speculate why. If she is an older woman she may be wary, not trusting her own excitement and loss of control. She may have been hurt in the past. The sub-text is therefore complex and may resonate with many readers. 
 The device of understatement is known as  litotes .
After the Lunch