He very much wishes he understood her answer, but when she begins dragging him, that's clear enough. Jack runs along with the little girl, oblivious to what the rest of his tribe think of him. Unaware that they're now, in fact, his tribe.
Jack has no intention of marrying anyone, but he's some healing left to do and free meals at his disposal. He sees no reason to run off just yet. Spending time with these people will give him time to regain his bearings. For now, he'll chase young girls.