我爱你埋藏在心底溃烂成泥
[wŏ ài nĭ mái zàng zài xīn dĭ kuì làn chéng ní]
It means 'My love for you has buried in my heart so deeply that it rots.' This is often used by users to express unfulfilled or hidden deep feelings, where the passion may fade over time, or due to being hidden for too long, turns to disappointment.