How do I give a second chance without becoming a victim who is trampled on again and again?

Giving a chance with an open heart is not the same as abandoning good sense; wise forgiveness comes with healthy caution. Set clear conditions and watch actions, not just promises. Decide in your own heart what you will do if the betrayal happens again, so you are not trapped in a cycle of forgiving without limit. Protecting your dignity and safety is a right, not a lack of love. Notice whether the change is consistent or only brief, to pacify you. Get outside support so your judgement is not clouded by hope alone. A healthy second chance rebuilds; it does not repeat the same wound. See trials in a marriage.