Can we trust Wendy Darling? I think she’s telling the truth.
The first time she was lying about not knowing about PP’s plans, and then Regina won her trust by saying John and Michael were trusting them to defeat PP. That is when Wendy came clean. Plus, we know from the promo for 3×8 that PP is putting a heart into PP. PP and Wendy were lying to Henry about needing to save magic. What PP really wants is for Henry to sacrifice his life so that PP can become immortal.
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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