I am curious as to why you first seem to have known your company had a policy at all was during this meeting with your boss? Shouldn't you have received a copy of all company policies so you can refer to then now to see what the wording actually was when you were first employed? Can you ask for a copy now? And certainly, I would expect, that if your company never made you aware of the policy then it's not enforcible this time around. And remember, they would have to PROVE you knew the policy was in place. Most company's will do this during your first day training and ask you to read it and sign something that says you read it. And then, often, they yearly put them back out and ask you to read and sign them again. If they left any of these things uncovered then they are going to have to review how they do these sorts of things and fix it. And policy is only enforcible if they can prove you knew them.
Good luck... but do some of your own investigation to protect yourself. Ask for the policy. And ask to see your files so you can see if you ever signed anything pertaining to that policy.