Seeing her approach made his heart skip, as it always did at the sight of his love, the beautiful Belle. And every instinct he had told him to wrap her into his arms and cling onto her, shield her from whatever dangers there might be.
If it hadn't been for Neverland, for the island taunting him so with images of her, he would have done just that. As it was, Rumple waited, hoping so vehemently that she would be able to provide the proof he'd asked for. Though quite how that proof would happen, even he didn't know. Neverland had gotten into his very mind, so asking questions, things only he and Belle would have known, that would not prove anything.
But if it was truly her, then she would find a way. The strength of their love would guide her and show him the truth. Of that he had no doubt.
So when she unwrapped that cup, that symbol he knew so well, his heart filled with joy.
"Belle, it truly is you." A look of wonder appeared on his face as he stepped forward, his fingers brushing over the cup before curling around hers. "I don't know how this is possible, but right now I don't care. I have missed you so much."