You were Natasha's kid, though you'd grown up in the Red Room, as your mother had been more or less forced to leave you behind. But, Natasha was long dead now. Now, after some incidents (where you and Yelena may or may not have tried to kill Clint) here you were, having a civil conversation. Well, kinda.

"I'm sorry I couldn't save your mother," He soon said. He knew you blamed him for Natasha's death. Hell, he blamed himself for it.