On the surface, the duality of pine and rattan means that pine and rattan are completely different, but in fact they are incompatible with each other (probably, I don't know much about plants)
Don't cherish each other when you meet, and don't say why you don't cherish this hard-won feeling, since you know each other. If this sentence is connected with the next sentence, it can be used as a rhetorical question.
It's just that Rui Xin didn't wake up as if defending the previous sentence, saying that women's love is still immature. Judging from the whole poem, this is just a melancholy woman's sigh when she is lonely. (Rui Xin, meaning the same as the big diameter of the heart)