Do we really fall in Love?

In this material world of selfish desires, we all fantacise living in our dream world of fulfilling desires, try acheiving our infatuation based relations to the extreme level of fullfilment... and in the procss of getting it say I Love U to many, develop transient emotional relation, get intimate mentally & physically, finally get hurt when it breaks up after some misunderstandings or unfaithfullness or overpossesiveness, resultant is that we say all men or girls are the same selfish souls... Yet there are some selfless devoted lovers still... they live for one and only one.. Sometimes happy but many a times called as emotional fools!! Tell me what your inner instict and your lovely or bitter experience says about it dear.....?