Because Sam Loves Him
Every tension-filled moment Sam experiences in his brother's presence since his unusual return from Hell has him dying to ask questions but he know he dare not
He can't be interrogated
Cannot be on the spot
That would be like cornering a vicious wounded animal..not a good idea
Asking Dean to reveal his secrets is futile.. Sam knows he wouldn't answer him truthfully anyway..
The first time Sam did ask quickly became his last
Dean had thrown a beer bottle past Sam's head and started yelling fiercely at him
'I'm not telling you! Don't ask again Sam, I fuckin mean it! Next time you do..I'll. kick. your. goddamn. ass. all. over. this. room. Don't think I won't!'
His emotional pain and angst so prevalent in his every movement
The inner-torment Dean has been silently suffering already started playing cruel and irreversible jokes upon his physical features
Bright green eyes once so full of life were now cold, fading and gray as stone
Light laugh lines instantly had been replaced by deep recessed frown lines
Hunched-over shoulders
Furrowed and heavy brow
He doesn't stand tall and proud anymore and is quickly beginning
to look much, much older than he truly is
Dean hasn't said more than a fistful of words to Sam in over two months
He's:
Distant
Angry
Violent
Withdrawn
Lately Sam had lost count how many times he's rescued Dean from himself
Halted spontaneous and unprovoked bar fights
Stopped explosive assaults upon walls before he broke both his hands
Sam endures hours upon hours of tension-filled silence during long road trips knowing
he can do nothing but second guess and wonder at what horrid memory is causing Dean's white-knuckled grip on the steering wheel
Sam does his best to help
He insist Dean keep his hair short
Lately Dean had been not only letting it grow long but it was dirty and unkempt
Sam begs and pleads with his brother to cut it and keep it short
He needs it that way so it's easier to clean while Dean's throwing up from one of his
now nightly drunken stupors
Staying awake all night for Sam is now routine
Dean's nightmares get so bad he wakes covered in a cold sweat yelling and screaming words and phrases Sam pretends not to have heard or understood.. but he does
How hard can it be to not understand what:
No
God No
Please
Please Stop
Just Fucking Stop
truly means..
Sam refuses to not be there to help his brother the instant Dean starts showing any
signs of having a nightmare
Jumping from his own bed and running to the side of Dean's-immediately dropping to his knees while trying to wake him up before the screaming starts
Sam hasn't slept more than a few stolen winks in weeks
Dean can't stand all Sam's fuss over 'just a bad dream'
Sam takes the shouting at him: 'Damn it Sam, I'm not a baby! I'm fine!' when clearly he is not
Right now, Sam's brother is the furthest fucking thing from 'fine' a person can be
But Sam remains faithful and hopeful that somehow just somehow the older brother he
loves so much will return to at least a small remnant of what he once was
and if that's all Deans' capable of.. then so be it. Sam will accept this "new Dean" because Dean is all Sam truly has left in this world to cling on to without he himself losing his own sanity
Sam does all this because he loves him
Continues to help because he cares
Because he has no choice
He's family
He's his brother
and if Dean won't take care of himself then Sam will do it for him..