At the end of Cardcaptor Sakura Movie 2: The Sealed Card..
As the sealed card appears to go to Sakura, it chooses Syaoran as the one who will lose their most important feelings because Sakura used too many cards at one time.
Crying and believing it's too late, but encouraged by the Hope Card, Sakura still confesses to Syaoran that she loves him and that he is her most important person. To her surprise, he gently replies that he loves her too, and Sakura realizes he didn't lose his feelings for her after all.
How was this possible? Was it because of the Hope Card? I just need some explanation for clarification.