No, I haven't seen the show, but a couple things you said really stood out to me as incredibly relatable.
I've wrestled with that feeling of being in my marriage still (my first DDay was March of 2022) in some measure simply because of fear of change. Like you, I can't unlove her. And I think it's more wrestling with this death of what was supposed to be and the future I had envisioned with her very much at the center of it for my life. Now I'm pretty sure I don't want that future, and it doesn't exist anymore anyway whether I stay or leave. That future now seems stained and less desirable, but the thought of it really not being my concern whatever she encounters in life (ups, downs, highs, lows, whatever) is just a weird and sad thought. It feels very permanent.
And I've definitely said multiple times, even directly to her, that if I could go back in time to 2019, 2020, and even parts of 2021 when she wanted to divorce me (to be with him, though I didn't know that at the time), I'd take her up on it and avoid everything that's ensued in a heartbeat. I think back to that pathetic man I was begging my cheating wife to stay and promising to be better and work through the issues, not knowing the real reason she wanted me out of her life so badly, and I wish I could go back in time and talk to him and let this version of me take over from there. But I don't ever think back to DDay and wish I had left then, because that woman seemed contrite and remorseful for what she'd done and desperately wanting to save us. I don't think I could've left that version of my WW without giving it a real try. But the body snatched alien version of her during the first couple years of the affair? Yeah, I could definitely leave that woman. And even now I find myself at times just wishing she'd cheat again and decide she didn't want the marriage and do the dirty work of leaving for me. There's a song by Morgan Wallen that recently came out called, "where'd that girl go" that speaks to me in a sense about this way. He's talking to a woman who's trying to rekindle the relationship with him, and remembering how she didn't want anything to do with him before and couldn't stand him and he was the worst thing in the world, and now that she's trying to be close he's like, "Where did that old girl go..." and I have similar thoughts.
And no, you're absolutely not a horrible person. I've cyber stalked AP a little bit and in the intravening years since discovery, his wife has stayed with him and they've had a child since then. And it boils my blood to think he gets to have a happy family after the bombs he threw into my family. He gets to move on and have a good life with the wife he was cheating on and finally got to be a father (something ww told me he always desperately wanted), and something inside me just wants to find a way to screw this whole thing up for him even knowing that ultimately would hurt his innocent wife and baby. I told the OBS, but apparently she still made the decisions she made to reconcile and ultimately start a family with him. I really hope he's getting zero sleep and the baby has colic and no sleep schedule at all. So no, you're definitely not a horrible person. You're a person, and we respond to deep betrayal and injustice how we respond to it, and it's not always just wishing the other person well.