从此没良心
[cóng cĭ méi liáng xīn]
'From now on, conscienceless' seems rather negative at face value because it directly mentions losing one's sense of morality after certain changes happening to oneself. But sometimes people choose these words may actually intend to indicate starting over or being freed from traditional morals after going through special periods or big decisions of life which make them grow into a totally different person.