The problem is if there was a single Brit and it was more than a casual online relationship (shown by evidence sent to support a fiancee visa) prior to the family visit then the BIA will wonder about how truthful the application for the family visit was ie the real purpose, who paid for it, where you stayed, etc.
As a lot of the immigration process is based on the BIA believing that you are genuine you don't want them starting to wonder how genuine you are, as they can give you a hard time, or at worse refuse you.
In the case being mentioned here they actually state that the Brit visited the Philippines because the Filipina didn't get her family visit visa hence admitting that her application for the family visa was not totally genuine.