Hi tpe,
Thanks so much for replying. I haven't read the short story (yet) but I got that scene completely. After the awkwardness of his last conversation with Jack, and knowing that this could possibly be the last time he may see him, the gravity of this situation affects Ennis so much, but because he is unable to verbalise his feelings, he keeps them so locked down within himself, that he has to finally let them out once he sees Jack's truck go by. I cannot begin to explain how much this scene affected me. It is so powerful, and very humbling to see Ennis break down over his realisation that he loves Jack and that he wants him. That's what I got out of that scene, and I would love to know what others did too. Sometimes I find it hard to express my thoughts/feelings about this film because I'm so emotional about it, and I am sure that there are others out there who are able to express themselves and discuss this in a far better way than I can.
I am still amazed, however, at how much Heath Ledger's performance bowls me over. That scene, him alone in that alleyway, breaking down finally, just about breaks my heart.