[His eyes drop, that another hot wash of shame and guilt just pouring over him. He feels awful. Maybe he should have said something sooner. He could explain that he was waiting to see if he would level off. Could explain that it had seemed less important in the face of trying to get back to whatever could be called normal after all this. All the press and politics that had come with snapping fifty-percent of everyone back. That Steve had been through enough trying to get him back to health and that had been a hell in and of itself. That some part of him just assumed it would be okay until it wasn't-

...Steve tries to go on but Tony suddenly can't. He feels terrible.]

I should've said something. I'm sorry. [He just says it. And lets it sit there so that there's no excuse backing it. He is sorry. There's not much he can do.] I'm good at this. Always have been. It's not on you. [He has some small suspicion that Steve will wonder why he didn't see the signs- Tony would blame himself, too, and he just doesn't want him to do that.] You'd think after how many years we've been together I would've learned by now. [So he takes it all on, self-deprecating as always but he doesn't let this one linger.] I've gotten myself out of tougher jams. I'm not going anywhere. [His fingers twine with Steve's and he holds on tightly, as he gazes at him.] I promise.