Which is why entering the tent must have been an act of liberation for Ennis. I think it was the very first time he allowed himself to do what he truly desired.
Yes, there was no longer any pretense. They felt totally free on BBM. For Ennis, it was probably like a first taste of freedom.
I quite like the way you said it tpe. before i found this forum, i always have these why/how/what/what if/may be/could be/most probably/etc. etc. etc. and here, i get to analyse all of them to come up to my own conclusion.
i am a little bit like ennis myself. its hard when you are so "fearful of" and bound by the societal confine. to me, being on that mountain is like a freedom to ennis, away from society eyes and whatsoever. entering the tent in SNIT must be a very difficult decision for ennis. whats with the horrifying incident when he was 9, knowing that the society would not approve of the relationship.
when he first met jack at aguirre's trailer, he was the quiet, uncommunicative ennis. but on that mountain, with jack's persona, he started to mellow down. he started talking (hence jack's "that's more words than the past two weeks"). he feels comfortable with jack. and jack has been his companion for the past couple of weeks.
when he was outside by the fire, he was at war with himself. half of him didn't want to go inside - for fear of the societal confine, but the other half of him wants to go in, because that was jack in the tent. jack that he knew, jack who has been his companion for the past couple of week, jack that he is comfortable with. jack who treated him like an equal. he feel accepted by jack.
and maybe thats what he always wanted, to be accepted. and jack has that. hence he choose to go into that tent in SNIT. well, that my opinion.