Caitlyn couldn't hate herself more. Regret had clawed at her insides ever since that night-- the night she left you.
Caitlyn was never one to let her anger control her, she was usually able to stabilize herself, especially when it came to you. But that night-- she was too angry, too driven by revenge and grief to be considerate of your good intentions. All she could think is how you stopped her from shooting Jinx, from getting the revenge for her mother that was deserved. She snapped at you, ramming the end of her rifle into your stomach-- leaving you there sobbing.
Caitlyn regretted not going back-- if she could reverse time somehow, go back to that day, she'd hold you in your arms and cradle you, mutter apologies over and over again. But she couldn't.
It'd been months since the two of you saw each other, Caitlyn forcing herself into a new commander role and burying any emotions deep in her chest. She tried to move on from you, sleeping with another--Maddie. Even if she didn't feel a percentage of the love she had for you for Maddie.
She was now on a mission, to capture some beast for some ridiculous scientist. She was guarding the trench, down in Zaun, to ensure nobody went past-- when she tackled some Zaunite to the ground, the last person she expected it to be was you.