Both have had a significant chunk of their life torn away: Bettina, discovering that her husband was unfaithful and the implied subsequent divorce; and Chuck, trying to re-discover himself after five years of solitude. Just as her angel-wing package provided a mental anchor for him on the island, ultimately he will seek her out as a mental anchor, a sort of substitute Wilson, as he rebuilds his life. It probably won't work out in the long run, but she seemed secure with herself post-divorce, and could probably help him come to terms with everything that's happened to him.