A second chance means nothing when the first lesson was ignored.

A second chance assumes the first one taught something. When the same behaviour returns unchanged, what you are offering is not another chance but a repetition, with the additional cost of having demonstrated that consequences do not follow. Generosity is genuinely good and it needs a condition attached. The condition is that something is different.

Before giving another chance, ask what specifically would be different this time and how you would know. If neither of you can answer, that is your answer. Wanting to forgive is not the same as having reason to expect change.