Do you believe that love should be proved? If so, what are ways to prove you love someone?

Do you think people need to prove their love or do they simply have to say, "I love you?" Do you think you need to be showered with gifts or is a simple compliment enough? Does the person have to be willing to die for you, take a bullet for you? Do you require commitment for the people who say they love you? How do YOU know someone loves you? And by someone, I mean husband/wife, boyfriend/girlfriend, mother/father, sister/brother, aunt/uncle, grandma/grandpa, cousins, friends, anybody who you would say you love and who would say love you.