Marlin doesn't know it, but Celia has been watching him.
He paces an awful lot, as if he has something constantly on his mind. Which is probably the case, since Farmergirl has just married Gustafa. Gustafa is a nice man – charismatic, intriguing, sweet – but Celia thinks that Farmergirl made a mistake. Not an incredibly hard one to make, but still a severe one. She doesn't know for sure – she doesn't even know her name. All she knows is that Marlin is a catch, one in a million, and that Farmergirl has let him escape.
She will not do the same.