Ahhhhh love

Yes it is here, VDay!!! The day when we celebrate love!!!!! My older sister is going crazy for her boyfriend, what to get, where to eat, bla bla bla i've heard it all before. But what is this love that we celebrate, and how do we know if we found it? I hear my sister telling her boyfriend that she loves him and he says it back but do they really know what it means? Do any of us really do? I health class we took a small lil test on what love is and what lust is. I bomded it becasue i used my dads example, but again what is love. Or what is the love that my health techer is trying to teach me? I think love is many things, There is the love that you share for your family. Then the love you have for God. Then the love for friends. Finally the love for another. This final love is getting me a little confused. I mean is it really possible for two people to really love each other forever and ever, or can the heart love more then once? Ummmmm what is the love that you share with another?is it real?is it for everyone?