我记得你是我最好的曾经
[wŏ jì dé nĭ shì wŏ zuì hăo de céng jīng]
It means 'I remember you as the best part of my past.' Expressing nostalgic reminiscence about someone important, perhaps reflecting on what was once valuable. The writer holds dear memories associated with this person who represented some great moments in their past. It indicates gratitude for experiences but may imply current distance or changes since those peak moments.