Repentance as a general rule in life doesn't mean to go back and re-repent for offenses you've already been forgiven of. If you'd allow me an analogy here; Take for instance a relationship between a husband and a wife... If the husband gets angry, huffs and puffs, uses name calling in a fight and then storms out of the house, shouldn't he apologize and she forgive? Of course. What about 3 months later when he does it again...does his asking her forgiveness for it over the last incident "save" him from the responsibility he should feel to apologize again for his disruptive behavior? Of course not. When we are "saved" it doesn't prevent us from sinning in the future, of course we have to go back and live in an attitude of perpetual repentance. The apostle Paul said "I die daily". He lived in an attitude of repentance before God, as should we all.