St. Valentine's Day falls on February 14, and is the traditional day on which lovers in certain cultures let each other know about their love, commonly by sending Valentine's cards, which are often anonymous.
Brazilian is not one of those certain cultures
(for commercial reasons - it clashed with Carnaval - Valentine's is celebrated here on June 12th) and yes, this is a holiday designed to sell stuff and, double yes, your affection should be professed every day not just today. On top of it all, Eric (Mrs. Manners) reminds us
: "Good manners dictate that one should not brag about one's good fortune"
and I won't brag about mine. For now.