I don't think love is something you can define. We all look at it differently.
It can't be just a feeling, I know that for sure. Love drives you to do things, love changes you, love makes you do crazy things at times. I guess if we go into specifics, it's completely different for each person, because we all think differently. One may think making breakfast for you is a way to show you care, others may think it's not. At the end of the day, I personally think when you love someone, you just know it, you don't have to question it, you don't have to second guess it, it's just there.