In the next moment, you find yourself in the ruins, in the room of the spider bake sale. You are standing at the entrance to the room and can see Frisk buying a few donuts and cider from the spiders. When she is finished and put them in their inventory, they see you in the doorway and freezes.
You can tell from her eyes that she has been crying, and almost constantly. "C-Chara...? Is that really you...?"
You don't say anything, you can barely stand to look at them. Despite what Wing had done you still held hate in your heart for them. Everything that they had done was unforgivable, and you aren't just going to forget it.
It seems they realize this, "Oh, yeah, I get it. I wouldn't want anything to do with me either. I'm surprised you're even here, I'm glad, very glad, but surprised. I understand that you wont talk to me, you don't have to, but it's nice to have you here."
You still say nothing, choosing to turn away from them entirely. You can't understand why Wing would ever think this could work out.
Frisk makes the rest of their journey to the end of the Ruins rather easily. Though they stop to greet every single monster they see, going out of their way to try and make their days better.
You don't think much of this, you can only wonder when it will end, when they will go back to their old ways.
When they reach the final fork, they don't even look in the direction of the balcony. It doesn't matter, monsters die in one hit from a betrayal kill anyway.
Frisk has their usual interactions with Toriel, choosing to talk to her a bit before going to bed. They climb into bed and lay there for a time. You are still as far from them as you can be, arms crossed and facing away from them. If you could turn invisible right now, you would.
After a time of silence, Frisk speaks. "Chara, I'm sorry."
This again, when will they learn that an apology means nothing?
"I know that saying it means nothing, but I mean it. I don't deserve your forgiveness but understand, I no longer have any desire to go down that road again. After dying to Sans hundreds of times I felt myself fading away little by little. I felt that if I continued I wouldn't be able to go back, that that would be it. It scared me, I was starting to become afraid of death again. Maybe he was somehow shaving away my LV I don't know."
Why were they saying all of this, it wasn't going to matter. You felt that they deserved to die over and over, it was cathartic for you to watch them die.
"But when you took over, everything changed."
You tense up at the mention of you taking over. You can still feel everything from that point. The wind against your skin, the sounds of battle, the knife in your hand. You grit your teeth to prevent yourself from shouting at them to shut up.
"While you were in control, all the memories of what I had done kept flashing before me. All those innocent monsters, Papyrus, Undyne, Muffet, Mettaton. I couldn't handle it, it was all too much. "
You continue to remain silent, you didn't care for their words, though you also couldn't ignore them either. You still harbor hatred for what they did, but maybe, just maybe, they are actually sorry.
Your continued silence signals to them that you don't want to talk, so they turn over to go to sleep. After a few minutes they start having a nightmare. At first you think they deserve it for what they did but when they start mentioning their parents is when you decide to step in.
You start softly singing a gentle lullaby and soon, they sleep soundly. You look over them as they do, flabbergasted that this same person not too long ago was slaughtering people for fun.
Maybe you could try to trust them again.