Sweetheart of mine, I've sent you a valentine. 

Sweetheart of mine, it's more than a valentine. 

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.