The US loved Saudi oil, not Saudi money so much. The US never really needed money from Saudi Arabia. The sole reason the US took a distinct interest in propping up the monarchy was for oil price and supply stability.
With the US boom in shale / fracking oil (and Canada's coinciding oil boom), Saudi oil not only matters less by the day to the US, but Saudi Arabia is increasingly becoming a hostile oil competitor looking to fight the US domestics for market share. That conflict will get worse by the year going forward, likely eventually ending with the US reducing its guarantees of security for the monarchy and with the Saudis turning increasingly to China for protection.
With the US boom in shale / fracking oil (and Canada's coinciding oil boom), Saudi oil not only matters less by the day to the US, but Saudi Arabia is increasingly becoming a hostile oil competitor looking to fight the US domestics for market share. That conflict will get worse by the year going forward, likely eventually ending with the US reducing its guarantees of security for the monarchy and with the Saudis turning increasingly to China for protection.