Rumpel’s actions in that scene also suggest that Robert did not really have true love in his life — not true romantic love with Ruth, nor true parental love for the boys — otherwise Rumpel should have kept the hair for a backup of the true love hair spell. Maybe a person has to be oblivious to personal guilt, like Charming and Snow, in order for his or her love to be pure.
I’m pretty sure Robert and Ruth did have true love. Ruth gave her emerald ring to David to give to his future wife. In episode 1×6, Ruth said, “True love follows this ring wherever it goes, my son. I had it with your father, I’ve had it as your mother, now you will have it. Take 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