He splits up from Belle, he gets kidnapped by Zelena. When will Neal learn that his best chance is to stick together as part of a group?
We don’t actually know yet that Neal and Belle split up since it sounds like they go on an adventure together. Perhaps Zelena then comes upon a them; Neal tells Belle to make a run for it and she escapes but he gets captured. Now Belle has been cursed to forget all of it.
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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