是我私心太多留不住你
[shì wŏ sī xīn tài duō liú bù zhù nĭ]
'It's my selfishness keeping you from staying' shows a sense of regret and acknowledgment of personal faults which prevented someone (or something) important from remaining in one’s life. It implies remorse for having been overly selfish before and missing out on retaining the person who mattered.