Is there love in this world??? Does it really exists or is it just infactuation?

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I had a girlfriend. When our relationship was new I was happy as never before. I thought I was in love and would not be able to live without her. But, later due to some misunderstandings we broke up. Now, after two years I met another girl whom I think I am in love but am not able to decide whether it is love or infactuation. I am missing her day and night. What can it be??