I really don’t think this relationship needs discussion or debate. I think the answer to your question is obvious.
It is clear that he is abusive and has no will to change.
No more chances, no more redemption.
Rumbelle is over. It was over the second he decided to become the Ultimate! Dark One and take all the power of all the previous DO.
I live in fear of the writers turning this relationship around.
The only thing that would save it is Rumple somehow giving up his powers voluntarily and without dying.
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Keeper of Regina's bravery