Stark was able to use his vast resources to cure Pepper Potts of the Extremis, removing her superhuman abilities. Stark used the cure to develop a method to extract the shrapnel within his heart without dying, and two days later, Stark underwent surgery from Doctor Wu in Hong Kong to have it removed.
He used the pieces of shrapnel that had been removed by Doctor Wu to make a necklace, which he gave to Potts. Since Tony Stark's Mansion had been destroyed by Aldrich Killian and Eric Savin, Stark and Potts moved in together at Stark Tower, which he had now redesigned and renamed Avengers Tower ready if he would ever again need to rejoin the Avengers for a future mission to save the world again.
Returning to his home's wreckage, Stark threw his Arc Reactor into the ocean, vowing that he was still Iron Man. He took the remains of his Dum-E and U to repair. Stark retired from the hero "business" for at least a year, but continued to work as a consultant for S.H.I.E.L.D. and run Stark Industries. He began helping S.H.I.E.L.D. by making repulsor technology for their three new Helicarriers, to avoid the issue that happened during the Attack on the Helicarrier.
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The Story of Tony Stark/Iron Man (Marvel Cinematic Universe)
ActionThis story tells the entire life of Tony Stark in the Marvel Cinematic Universe and how he became Iron Man and joined the Avengers and became their leader alongside Captain America. My 2nd favourite MCU superhero and Avenger.