A part of me feels that Ruby understands the difference in the deaths, like Garou and Ai were killed and there was no justice, she wanted to punish the ones that took away the most important people in her life.

But now she is still upset and grieving, but maybe she feels like she got that justice she was looking for, but it cost her someone really dear to her.

So she is grieving her love, but sort of understands how much he loved her when she probably got told of the assassination attempt and him putting a stop to it once and for all