Very painful!
It's so clear that both of them are talking with their emotions shredded and not with their rational brains. She's not taking in what he's telling her - including the fact that he almost died and that it had something to do with her - and he's not taking in how much his lying hurt her.
At least she didn't want him to leave!
But now look what you've done! Lois calls Superman Clark just as Lex arrives!
Wendy