during my company paid training i received a job offer and decided to take it , when I'm required to pay it back?

There is no company in place yet about that and I never signed anything to that affect but my manager sent me a note that looks like this: "I have been working on a policy for high cost training items, like this one, where the employee must agree to payback a prorated amount of the cost should they choose to leave (company name) within a year of completing the training. (This policy effort mostly comes from the large # of employees who have left shortly after completing the expensive CISSP training.) (Example: Employee takes a $4,000 training and leaves CI 6 months after completing it. This employee would have to pay back $2000 of the training costs.) This policy is in the works with HR currently finalizing the last aspects of it. When put into effect, this policy would be applicable to the training you outlined below.