Don’t let the devil get a foothold on you! Once God forgives, He looks at us as if we had never sinned and casts that sin as far as the East is from the west! You are forgiven and you remind the devil any time he tries to bring it up! 

Isaiah 43:25
I, yes I, am He who blots out your transgressions for My own sake and remembers your sins no more

Psalm 103:12 
As far as the east is from the west, so far hath he removed our transgressions from us.