It's been quite some time since Rumple has started to get really careless about protecting his dagger.
Let us be reminded : he got is needlessly stolen by Belle while she was kissing him. Almost the same trick happened while Gideon was cuddling him...
He also lost it after some dubious trick on Mr Hyde. Then the Black Fairy took it... well, he was quite powerless to prevent this, wasn't he ?
Anyway, all these episodes are quite awkward, since Rumple explained to Gideon, just a few episodes ago, how wise he turned out to be after living a few centuries, and so on. That's a big contradiction between his "wiseness" and his reckless actions. Doesn't fit at all.
I'm very disappointed with how the show is going ; still watching it for Rumple. But probably not any more if he continues to appear so silly (and so non-Rumple-ish...)...