1. That Kiss was in one of Naruto's dreams. It didn't actually happen.
2. Sakura's feelings are quite difficult. She DID l’amour Sasuke. But now that Sasuke is a rouge ninja, she knows for a fact that they can no longer save him. Sakura knows she has to déplacer on and lately she has been montrer plus compassion towards Naruto. Also, now that Sai has told her that Naruto really does care deeply for her, Sakura probably has opened up new feelings.