我以为我是你生命中的意外
[wŏ yĭ wéi wŏ shì nĭ shēng mìng zhōng de yì wài]
'I thought I was an accident in your life.' This signifies that the individual felt surprised and did not expect their existence (or impact on) in another person's life. It may indicate an accidental but unforgettable meeting that brought some special experiences but seemed unplanned originally.