[Part of him is curious to know how she knows his brother, but mostly he doesn’t really want to talk about him anymore either. It’s only proving to make him think of what was happening when he’d last seen him. Not something he particularly likes to think about.

If he were ever to find out about her relationship with her sister, he would understand that quite well too. It wasn’t easy living in your sibling’s shadow, no matter the conditions.]

I would not expect you to. I cannot imagine a scenario where he deserves forgiveness from anyone he has affected. [But, he would guess, she had it worse than most who had had a run in with Thanos.]