What is the meaning of this sentence "since ancient times, sentimentality is always hurt mercilessly"?

"Since ancient times, sentimentality has always been hurt mercilessly": If you are affectionate, you will often be unable to understand it, leaving regrets and feeling pain; Affectionate people are often hurt by fickle people, and heartless people are rarely hurt.

"since ancient times, amorous feelings have been empty and hateful, and amorous feelings have always been hurt mercilessly" generally means "since ancient times, affectionate feelings have always been hurt mercilessly"

This sentence comes from two poems:

In fact, "Love and hate in leisure time since ancient times" is an anonymous poem by Shi Qingxi, a scholar in Qing Dynasty, because "love and hate in leisure time since ancient times are the easiest to wake up from a good dream." In addition, there is a whole poem in Wei Zian's novel "Flower Moon Mark" in the Qing Dynasty, which is:

Affection has been idle and hateful since ancient times, and good dreams are the easiest to wake up. ?

Isn't it difficult to take off flowers, poor flying catkins are too falling. ?

Xiang Chao suddenly married Yuanyang Society, and the new sentence is like a jade screen.

Not because parting is broken, tears are full of old shirts.

"Affectionate is always hurt mercilessly" comes from Affectionate but Ruthless Annoyed, and from Su Shi's Dead Hua Lian.

Iris, flowers fade, red apricots are small and green.

Flowers wither, red apricots swallow, green water people around.

There are few willows blowing on the branches, but there are many herbs in the sea.

Swing inside and outside the wall. The layman in the wall, the beauty in the wall laughs.

Laughter dies in silence, but passion is mercilessly annoyed.