Hello hnh,
You certainly pose a question that can go very deep and get very philosophical. Many people have tried for a long time to try to define and quantify love. Google it and you will see everything from the mushy heart stuff to a scientist trying to explain the chemical reactions to the clergy trying to explain the inner being. Our perception and our definition of love is deeply based in each of us. It is based on our life experiences, including some we may not even remember. It is further defined by our expectations, our hopes and our dreams.
To me the definition of "LUST" is simple. It is simply the strong desire for something...could be anything. Our conversation is is obviously based in a lust for physical contact, sexual gratification or intimacy. But we can also lust for power. We can lust for a new car. We can lust for the latest flat screen...you get the picture (lol, pun intended);).
The definition of "LOVE" gets much more complicated. Love is a physical and/or an intellectual and/or a spiritual and/or and emotional bond with another being. While society often uses the term interchangeably with "LIKE" when referencing inanimate objects, to me its silly to love a car or a tv, etc. Some may ask why. I would simply say for there to be love, in my opinion, it has to be reciprocal and your car will never love you back. :lol: Of course there is also unrequited love...but that is a subject for another thread.
Back on subject, belladonna said earlier when you feel it, you will know it. In my experience I would agree with that statement. When you fall in love it will feel like nothing else. The essence of the other person will consume your mind, heart, soul and body. Love, true love is unselfish and unconditional plus many, many other things. But time is the true test. If you are not certain...give it time. Be sure. Make sure there is reciprocation. And of course there is the reality check...will it work for both?
Time - love and the question of permanence. Will it last? How long? Only that can be answered by the "couple". A large number of people believe we mate or pair for life...then the reality of the divorce rates just slaps you in the face. Is it because it is too easy to divorce in today's society of "do-overs". Or is it because man is entitled to more than one meaningful partnership relationship in his lifetime? Hmmm....:?: Yet another topic.
I have many thoughts on this and could go on, but I believe that covers the high spots and gets to your point.
Good luck in all your ventures.
Have fun.
jman47