Perhaps Cassie gave Ennis a lesson about how to live your love without knowing it,because his face when she´s gone crying and his when Alma Jr. tells him:-"Yes,daddy,he loves me",make us think that he´s applying these feelings and words to his relationship with Jack,doesn´t it ?.But I don´t think he was ready for a change with Cassie,because he always knew their relationship wasn´t going to arrive too far away,since he didn´t want to make her unhappy,as he did,indirectly or not,with Alma.What we know for sure is that,in spite of their last argument,in which they said all what they must have said long before,Ennis wanted to see Jack again by taking the iniciative with an invitation card-that never arrived to Jack-.This means something,IMO.