If you bring up Yemen and Saudi Arabia to make Iran look bad without mentioning the atrocities occurring in Yemen with the support of Saudi Arabia and the USA, I cannot take the rest of your comment seriously.
I remind you to "Have curious conversation; don't cross-examine. Please don't fulminate. Please don't sneer, including at the rest of the community. Please respond to the strongest plausible interpretation of what someone says, not a weaker one that's easier to criticize. Assume good faith."
In relation to the sanctions that were imposed as part of the U.S. pulling out of the nuclear deal despite Iran complying. But of course you left that part out.
Remember that the nuclear deal only dealt with nuclear matters* , all the other regime behaviours (hostage taking, supporting terrorists, missile development, etc.) remained. Stable relations between US and Iran are impossible without the regime changing its ways, the regime has no reason to change so long as the deal exists, ergo there won't be stable relations.
* Even the nuclear terms expire in about a decade, leaving Iran free to do whatever. There used to be a similar deal with North Korea, and we saw how that ended up.