It took her a while to actually cry everything out, but eventually the sobs lessened, and she stopped shaking, and actually felt able to lift her head from his shoulder again, roughly wiping her face to brush away the tear tracks. Rebekah felt simply exhausted, and weaker than she remembered being for a long time, and she did still lean against Nik's side for a while.
She didn't say anything about Caroline. She loved that girl herself, she really did, but that didn't stop it hurting that Nik clearly loved the other blonde more. A part of Rebekah did still wonder what he would have done if Caroline had been the one in the Cage, not her, but then she knew, didn't she. There would have been rage and deaths and the Original Hybrid tearing the world apart to get his love back. But not for her. Slightly awkwardly, she pulled away a little, not moving away from him as such, but straightening herself up so she wasn't leaning into him, drawing her knees up and wrapping her arms around them, somewhat defensively.
"I know you don't understand it." Her voice was slightly husky from the crying. "I don't know if you ever will. I did it because I couldn't not do it. I saw you in danger and I had to save you. Doesn't matter how much you hurt me, or that I know you'll do it again, you'll lose your temper some day and I'll suffer for it. None of that mattered in that moment, all I knew is I couldn't let you fall. Just wasn't an option for me." Never would be. No matter how angry she might get at her brother, she loved him. Always and forever.
"I wouldn't change it." The words were abrupt, and she was staring at her knees. "If I was given the chance now to go back and let you fall instead of me, I wouldn't. I feel like I'm losing my mind, but I can't let you go through that. I won't, not ever."