Ah Gu Explanation : It's not easy to stay with your love together forever, you'll need to tolerate, understand, care, share, love each another. Nowadays everyone only cares about their own dreams, career and benefits. Not many is willing to take such burden.
花开堪折直须折，莫待无花空折枝 Hua Kai Kan Zhe Zhi Xu Zhe, Mo Dai Wu Hua Kong Zhe Zhi Ah Gu translation: When you see a flower is blooming, and you may pluck it, go ahead. Don't wait till you are left with the twigs.