I have a hunch that inadvertently, Regina will help to cement Rumple and Belle’s relationship. They will need to bond quickly and tightly (and possibly, team up with the Charmings, who will be kind of a role model for forgiveness, I think) to protect themselves against Regina. Wouldn’t Regina just love that, knowing that she’s a Rumbelle catalyst? 
The more I think about it, the more important it seems to me that the first statement Belle made, upon remembering her true identity, was “I love you.” That statement grants freedom for candid discussion. She and Gold can clear the air, knowing from the outset that their love is intact. (That’s not a guarantee for an HEA, but it’s a necessary first step.)
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