The Ending...(SPOILER)

[Ragenti]

At the end you see what happens with all the organisations and groups, but they didnt say anything about my personal favourite group: the brotherhood of steel, I was a member of them, did all optional things for them and they where actually the reason why I killed Mr. House because he wanted them death no matter what I did. So I just want to know what happened to them, and hopefully somebody knows, or saw it at the end.

[JDC UK]

There's one ending where the BoS take back Helios One from the NCR.
It was one of the post-ending world changes that never made it into the final game.

[Ragenti]

Oh, pretty ♥♥♥♥♥♥ if thats the only one and its not even in the game:/

[Vita, Mortis, Careo]

5 different endings. Depends on what you did.

Destroy the BoS:

Buried beneath tons of rubble, the Mojave chapter of the Brotherhood of Steel was no more. Those few who were outside the Hidden Valley bunker when it was destroyed settled into new lives, or headed west to find a new chapter to join.

Did not destroy the BoS, Caesar's Legion victory:

During the fight for Hoover Dam, the Brotherhood took HELIOS One, inflicting heavy damage on retreating NCR forces, but it was a pyrrhic victory. Once The Strip was secured, Caesar's forces overwhelmed and eventually routed the Brotherhood from HELIOS One and Hidden Valley

Did not destroy the BoS, Independent ending:

The Brotherhood used the battle of Hoover Dam as an opportunity to retake HELIOS One, and came to control the area between it and Hidden Valley. With no organized opposition, their patrols began monitoring trade along I-15 and Highway 95, seizing any items of technology they deemed inappropriate.

Convinced the NCR to sign a truce with the BoS, Independent ending:

Due to their temporary truce, the Brotherhood allowed the NCR to retreat from the Mojave Wasteland without incident. In the relative peace that followed, Brotherhood patrols appeared along major roads, harassing travelers over any bits of technology they had.

Convenced the NCR to sign a truce with the BoS, NCR victory:

The Brotherhood and the NCR in the Mojave Wasteland declared an official truce, despite continued hostilities between the two in the west. As per their agreement, the NCR handed over all suits of salvaged power armor and in return the Brotherhood helped patrol I-15 and Highway 95.

[Ragenti]

Thx:), its just strange that none of those appeard on my ending screen, I had the "did not destroy the BoS, independet ending"

[Vita, Mortis, Careo]

Then in your case the BoS shot up the retreating NCR and then became tech raiders.

[theUSguy425]

http://fallout.wikia.com/wiki/Fallout%3A_New_Vegas_endings
If you want to have the endings spoiled, this shows the variants of the endings for the main game.