Hi, Sammi, and welcome.
In terms of hope, I think Ang tried to add a hint of hope to the film that may be lacking in the story.
Ennis's coming around to decide to attend Jr.'s weddding, complete with a Cassie white wine toast, is a hopeful sign. Plus, he finally says the word "love", when asking about Kurt, all the while looking out the window of his little trailer, and, presumably, thinking about Jack.