Real love is much deeper than Valentine's. Valentine love is essentially shallow, temporary, and commercialized.
Real love is not infatuation or fleeting romance when you think she's as sexy as Angelina Jolie or as cute as Angel Locsin. Real love is when she's nothing like Jolie or Angel -- but you'll love her anyway!
Kidding aside, real love is a decision. Even though you don't feel like loving, you choose to love. It's not just emotions. Over 2000 years ago, a great Savior showed that kind of real love to mankind. God decided to make sure that no one goes unloved with His saving grace.
St. Augustine paints a picture of love: "It has the hands to help others. It has the feet to hasten to the poor and needy. It has eyes to see misery and want. It has the ears to hear the sighs and sorrows of men."
Thus if you truly love another, it goes with the action of service. You prove your love to the other by lessening his or her burdens. That may manifest in a variety of ways. Like saying "Thank you" or "I'm sorry." Like helping in family chores or responsibilities. Like being there just beside the other in times of sadness.
One unknown author left us with an inspiring quotation that has already been quoted hundreds of times: "I shall pass through this world but once. Any good therefore that I can do, or any kindness that I can show to another human being, let me do it now. Let me not defer or neglect it, for I shall not pass this way again."