我没心没肺活该撕心裂肺
[wŏ méi xīn méi fèi huó gāi sī xīn liè fèi]
This username conveys the idea of being carefree, as if someone's lack of feeling or concern (represented by 'heart' and 'lungs') leads them to have more intense emotional pain later. This implies self-reflection on past behavior leading to emotional turmoil.