[Verse (omitted from film):] Sweetheart of mine, I've sent you a Valentine Sweetheart of mine, it's more than a Valentine [Refrain:] Be careful, it's my heart It's not my watch you're holding, it's my heart It's not the note I sent you That you quickly burned It's not the book I lent you That you never returned Remember, it's my heart The heart with which so willingly I part It's yours to take, to keep or break But please, before you start Be careful, it's my heart