心心念念只是我以为
[xīn xīn niàn niàn zhĭ shì wŏ yĭ wéi]
'心心念念只是我以为' translates to 'What I miss was only what I thought it would be.' This expresses disappointment that expectations have not been met or were merely wishful thinking. The individual may have cherished hopes and dreams which turned out differently, reflecting nostalgia and disenchantment.