Good questions which provide me to emphasize that the vast majority of HPV infections are self limited and go away with the passage of time, no matter where they might occur.
In addition, it is important to realize that both cervical and, to an even greater extent, oral and throat cancers, while related to HPV infection, are VERY, VERY rare. Furthermore, they are likely to have their risk amplified by co-factors such as smoking.
Putting these two statements in context, what is done is done. There is no risk for you to be worried about this "ancient" history as it relates to either your current risk for either cervical or oral/throat cancer, nor is there any reason for you to modify your sexual practices. Now on to your questions:
1. The natural history of HPV-related abnormalities does take years to progress and, while it is not a guarantee that you are going to develop problems in the future, having been examined and found to be clear makes it even more unlikely that the tiny, tiny chance that you will develop one of these HPV-related infections will come true.
2. See above, no reason to change current practices.
I hope these comments help you. You have no reason to worry. EWH