Im sorry in advance for this
And I ... am ... Iron Man.
Everything went white. Tony knew it had to be done. He did it for the universe, the world, the team, Pepper, Peter and Morgan. He wanted everyone to be able to live out the rest of their lives without Thanos destroying them. And he did it. He heard Peter crying, and Pepper whispering in his ear and as he took his last breath he was finally at peace.