What occurred in the final scene between Renee Walker and Jack Bauer?

In the final scene of the show, Renee Walker confronts Jack Bauer about his recent activities. She has been following his trail of destruction, and knows he has been involved in some shady dealings. Jack is unapologetic and insists that he had to do what he did in order to protect the country, but Renee is not convinced. She points out that his actions have caused a lot of damage, and has put a lot of people in danger. She asks Jack if he has any regrets, and he acknowledges that he could have done things differently. Renee then tells him that she will be keeping an eye on him, and that she hopes he can make some positive changes in his life. Jack then looks away, obviously conflicted. In the end, Renee leaves, leaving Jack to contemplate his future.