Limerence

"This isn't love. Nor is this, strictly speaking, a honeymoon period. Instead, we are in limerence. Limerence, a term coined some years ago, defines a state often mistaken for love. Those overtaken by limerence experience obsessive longing for another person. They subject the other person to often irrationally positive evaluations. They develop a degree of emotional dependency on the object of their obsession. And they interpret even the slightest sign of affection in the other as a declaration of reciprocal love. But the love is imaginary. Obama promised to bring a puppy dog to the White House. We are that puppy dog." From Foreign Policy in Focus

That's one neat word!