I did a quick google search of blogs that discuss the meaning of love. The list is long, but most of them are not very insightful, at least not to me.
Last time I tried to place a theory on love it was putchniks wheel of emotion. All I could muster is that what I had previously thought of as love was in fact admiration. In simon's case probably pity.
Lately I read in a blog called "Chemo Chic" the proposition that love is not an emotion, or a feeling, it is a decision or I think the author called it an action. This is starting to rest rather well with me. Yes I think love is a decision because at some point you can stop yourself falling in love.
I am hopeless at making decisions, but I fall in love easily. At first this may be inconsistent but actually it is not. Because my decision making style is Heuristic (Rule of thumb, trial and error, or intuitive judgement). Thus every man I get involved with is "the one" until proved otherwise. Many are also dismissed because I don't like them at first sight.
More analytical types might judge each prospective partner against a measurable checklist and not make that decision until they were sure of compatibility. Which explains the phenomenon of young Thai girls falling in love with paunchy old gentlemen.