She probably was just shocked at how nonchalant Jimmy was from reading the leader. Either Jimmy is hurting and just faking it, which is sad, or Jimmy just simply doesn't care anymore about what Chuck was trying to tell him, which is also sad. This to me is the most likely reason.
There's many theories out there about her reaction too (she wrote it, etc.) There's one theory haven't heard mentioned, partly because it's so convoluted. This is the theory that Jimmy wrote it, and that Kim know's that Jimmy wrote it. So Kim steams and opens the letter. It includes some bad things, maybe even some things about Kim, and some other private things. Maybe some things that would make Jimmy look bad in Kim's eyes. Now Kim can't just complain about this to Jimmy depending on the information, since it was a private letter. So she puts it back. But, Jimmy sees the letter, opens it, reads it, then writes an alternate letter that is more neutral or positive and puts it back in place. So of course when he reads it, Kim knows that Jimmy rewrote the letter to save face and or protect her, who knows, and that's why she's crying.
Now, I know this is too ridiculous. There's only one reason I would think a scenario like this is even plausible - I just don't see Jimmy reading that letter out in the open next to Kim. I just don't see him doing that. He has done so many bad things, even things Kim doesn't know about, that could be mentioned in that letter and I don't see him reading it out loud like that. It could even include things about how Kim was overlooked for becoming a partner partly due to her association with Jimmy and maybe Jimmy doesn't want to hurt Kim so he fakes the letter. Everybody thought the letter could be one last chance for Chuck to stick it to Jimmy, but maybe it ends up being one last chance for Jimmy to stick it to Chuck by forging his writing and signature AGAIN, and knowing this is too much for Kim to bear.
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