This is also a ploy of shaytān that despite being granted the tawfeeq to do tawbah, one continues to remember the sin and remains despondent. Through the barakah of tawbah, Allāh ta'ālā purifies the sinner. Our beloved Prophet sallallāhu 'alayhi wasallam says:

The one who has repented is like the one who has no sin. (Ibn Mājah)