By the way I was really angry at Ennis the other day for saying infront of Ellery that " when I die, I want to be here with Jack" I mean how insensitve.
I can see how this statement of Ennis's might rub you the wrong way.
My feeling on this is that it's only right. Ennis loves Ellery openly. I would not be surprised if at some point in the near future he told him that he wants to spend the rest of his life with Ellery. This is what he could not do for Jack, what he wasn't prepared to risk for Jack.
Ennis is going to live with Ellery and cry with him and be there with him through good things and bad things and they're going to have fights and make up and celebrate anniversaries and build their own home and family.
Ennis is giving his life to Ellery. I think I understand if he wants to give his death to Jack. It's the only thing left that he CAN give him, whereas he can give Ellery everything else.