After everything that’s happened—first learning that humanity had survived the bombs, then discovering ALIE, and then everything with Sanctum and the stones and Bardo—Clarke feels like nothing should phase her at this point. But being told that other universes exist is still throwing her for a loop.
She’s quiet for a long time, staring at one of the familiar scenes on the wall—an image of her and Finn peeking at the glow in the dark plants and insects that first night on the ground—trying to let everything sink in. It’s like her entire worldview is turned on its axis. This is insane, right? She’s having a dream or a nightmare. It’s not real. None of this can be real.
Source: We are all caught in the in between (Of what’s real and what’s a dream?) – Chapter 1, by wreck_jroth_club – The 100 (TV) [Archive of Our Own] | https://archiveofourown.org/
The ultimate, epic fix-it of the nightmare that was the ending of The 100, letting Clarke experience literally dozens of possible her life (and those of her loved ones) might have taken. Surprise, surprise, a lot of them feature Bellamy. The man she killed. The man she loved.