Tomorrow will be the day when lovers celebrate... hearts and flowers will pop out here and there :)
There's a great deal of idioms, sayings and phrases illustrating love (or related to this word )... I've collected some of them in this 'lexis - recap' sheet. There is no translation because the examples are plain and easy to understand : all you have to do to get the vocabulary sheet is click on the cartoon "bear in love"
The infographic below ⇓ illustrates a series of data about love relationships evolving -in different countries, and at different life ages (clicking on the illustration gets you to the full size picture) :
As for a short history of St Valentine's Day, you have to be patient... until February 14 :o)