The boy (Srngi) was not happy because he committed a great mistake (cursing Maharaja Pariksit), and he wanted to be relieved of the burden on his heart by crying

Expressions researched:
"The boy was not happy because he committed a great mistake, and he wanted to be relieved of the burden on his heart by crying"

Srimad-Bhagavatam

SB Canto 1

The boy was not happy because he committed a great mistake, and he wanted to be relieved of the burden on his heart by crying. So after entering the hermitage and seeing his father in that condition, he cried loudly so that he might be relieved.

SB 1.18.38, Translation and Purport

Thereafter, when the boy returned to the hermitage, he saw a snake on his father's shoulder, and out of his grief he cried very loudly.

The boy was not happy because he committed a great mistake, and he wanted to be relieved of the burden on his heart by crying. So after entering the hermitage and seeing his father in that condition, he cried loudly so that he might be relieved. But it was too late. The father regretted the whole incident.