How to understand the poem "Give your heart but be treated as a fool"?

Poems that give sincerity but are regarded as fools are as follows:

1, stayed up all night, trying to understand one thing. People are as thin as paper, and people are not terrible. What is terrible is the human heart, which is really sad. In the end, there is only chilling, no pain, just don't want to say it.

2, people's hearts are long! What I really get is chilling. I have to pay, but I can't get anything in return. This kind of life is not what I want.

Some people, the more you pay for them, the more sad you will be. Let go of some love early, and you won't be bruised all over, pay sincerely and return in despair.

4, time, don't waste on worthless things; Feelings, don't pour into people who don't know how to cherish. Some take the initiative and some ignore it; Some care, some don't feel. Why use sincerity to get sadness, and finally only chilling; Why should we use attention to save indifference? In the end, we have to ignore it.

I traded my sincerity for your betrayal. Is it my fault, or do I like you so much that I feel torn to pieces by you doing this to me?