How Do You Define Love ?

I am sure many of us may have thought of this question many times in our life . You must have faced this question for sure if you had ever tried pursuing a one way love :). The main confusion about it is actually what makes it different from close friendship .Leaving apart all the physical attraction and actions ,love is very similar to close friendship. It is very common for a guy or girl to fall in love after years of friendship,many may argue but given you r his /her only close friend and if he/she totally depended on you on most of the occasion there is a very good chance for a spark to appear .