He realizes something else then, clinging with all he has now and feeling truly wrung out. "It was like before, with Loki's glow-wand. I... I just lost control. That suit made me feel like my father, and I didn't like it." Tony takes a deep breah in through his nose and tries to explain this better, putting enough distance between them to catch her eyes. "He was talking about how I didn't come for him, in his time. How he needed me and I wasn't there and I don't know why I--" Why wouldn't he be there? Pepper knows he's always there for whoever needs him, despite any other shortcoming he may have.
"It made me angry. I don't even know why I was so angry." But he was and it resulted in alienating his only other ally here.