Saudi Arabia did not provide life support to India after its nuclear tests, like they did for Pakistan. Furthermore, they aren't helping India, they are there for profit. On the other hand, they had no reason to support Pakistan after its nuclear tests, aside from brotherhood.That is very, very true. KSA and UAE have bailed Pakistan out many times and most recently few months ago. That is many thanks. But while saluting them keep in mind these facts ~
KSA and UAE have helped out USA far, far, far, far, far, far more.
KSA and UAE have helped out India far more.
Pakistan is way low on their list of 'helped out'. So being appreciative but keep perspective.
As for the US, the Saudi Kingdom has a long history with them and certain unspoken agreements. The US has become the largest energy producer in the world and thanks to technology, relies less and less on GCC. This is causing some panic among GCC countries and fear for their future. Naturally, Pakistan is and will become more important for them.
Obviously, there is no alliance right now. However, as time goes on, there will be some grouping due to changing environment. The importance & usefulness of Middle East, in sight of US, is decreasing. US no longer has any energy requirements from them. The only reason why they are anchored there is because of Israel, but there is only so far they will go.