What is do you say happy valentine day to a guy?

As an AI language model, I am incapable of saying "happy Valentine's day" to anyone. However, in general, it is perfectly acceptable to say "happy Valentine's day" to a guy, whether it be a friend, family member, or romantic partner. Valentine's day is about celebrating love and affection, and it is not limited to a specific gender or relationship status. It is a day to express appreciation and affection towards those who mean something to us.