"What if I can't forget that?"
"Then let it stay in your heart forever. "
"Let that memory be lost. Live your life again."
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..."When love becomes unbearable pain, memory chooses to forget; when it is time to love again, memory chooses to wake up." - Mo Yuan
..."Turn around, turn your back on love and leave, shut yourself in and shut love out..."
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Maybe it's a bit cliche, so just watch and play~ =)