Trump’s Iran Peace Pact — or ‘Wishful Thinking’?

The article cites PUBLIC instances when previous Iranian leaders boasted about cheating on nuclear deals. Why are we trusting them? Because they promised they won't pursue nuclear weapons? Iran signed the NPT in 1968. So they already "promised" this before. In return for giving them billions of dollars in sanctions relief and opening up the Strait of Hormuz to their oil tankers, what, exactly, are they giving up?