I don't know, that sounds like love to me.
I don't think feeling "crazy" for someone is necessary at all to be in love. I've never had "butterflies in my stomach" for any of the people I've loved, because they made me feel comfortable instead of nervous. When it happened, it was just a natural connection and I wasn't afraid of being rejected anymore. It's how I prefer things to be--though I do value comfort and companionship the most in relationships. It might be different for you.