Unfortunately, I think Belle may have been brainwashed. Knowing how Rumpel and Belle felt about each other, I doubt Regina would allow her to keep her memories without asevere consequences.
That’s my thinking as well. Regina has been actvely trying to keep the fairytale couples apart. Mary Margaret and David in particular. So, it makes sense that she would capture and brainwash the true love of her greatest enemy. I think she’s planning to use Belle as a tool to unhinge Mr. Gold. So, we may have to wait a little longer for our reunion. 😥