Here is a quick game that we play at our Valentine's Day party that I submitted and had published in The Mailbox Magazine several years ago. It is played like Doggy, Doggy, Who Stole Your Bone only using an empty chocolate heart box instead of a bone.
A student sits in a chair with their back to the class and the heart is placed under the chair. After a chosen student "steals" the heart and hides it behind their back, the class recites the chant and "sweetheart" will turn around and take 2-3 guesses as to who stole their heart. If sweetheart guesses correctly, he/she gets to be the sweetheart again. If they do not correctly guess the theif, then the heart theif gets to be the sweetheart. Continue playing until all students have had the chance to be the sweetheart.
I'll back back soon with more February ideas. In the meantime, check out some of these February things...