At some point, Rumple was filming with Regina and Captain Hook on the Jolly Roger. 
I still haven’t seen actual photos of Belle on the ship, just the dock, but I doubt Rumple would leave her behind again. Last time he did that to go to NYC, she lost her memories.
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"That’s how you know you’ve really got a home. When you leave it, there’s this feeling that you can’t shake. You just miss it." Neal Cassidy