True love is unconditional - like Teddy057 said above, you go out of your way because it makes the other person happy, not because you expect something in return - making them happy makes you happy - you put them before yourself.
As for whether you love somebody or are in love with somebody - the former refers to all kinds of love, you know, like you love your family, your friends, anybody that you care about and are fond of, genuine affection - the latter is a much higher and intense emotion.
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Love is like a merry-go-round: you get all dizzy, and then you feel sick!