Would repeated violation apply to a person who swore not to return to a sin, and if he did, he would fast, then added "and every time" after his initial oath? And would repetition apply if he doubted whether he said "by God Almighty, every time" or just "every time"?

The intention does not affect the oath unless it occurs before or during its utterance. It is not considered if it arises after the oath has been sworn. Similarly, uttering words that imply repeated breaking of the oath, such as "every time," is not considered unless it is connected to the oath and the speech is uninterrupted. This is supported by the principle that the expiation is not to be repeated. As for doubt about the utterance having occurred, no ruling is based on it, for the original state is the acquittal of responsibility, and certainty is not removed by doubt.