爱你不是三分热度爱你倾尽七年真情
[ài nĭ bù shì sān fēn rè dù ài nĭ qīng jĭn qī nián zhēn qíng]
'Loving you isn't a fleeting passion; it's seven years worth of heartfelt sincerity'. This demonstrates profound and unwavering devotion over a significant period of time - seven whole years dedicated to loving one person truly.