This is not the first time my spouse has been unfaithful. How do I assess whether to continue?

One mistake that has been sincerely repented of is different from a repeated pattern showing that betrayal has become a habit. Notice whether each time they truly change or merely become more careful not to get caught. Repeating it after promising to change is important information, not something to ignore in the name of patience. Caring for yourself and protecting your dignity is not a lack of faith. Weigh the sincerity of their repentance, your own wellbeing, and the long-term effect on the children. Get the view of a counsellor or a balanced, knowledgeable person before deciding, and refer to a religious officer about your rights if you choose to separate. Your decision should be based on the real pattern, not on hope alone. See trials in a marriage.