Because Olivia was going to give up her memories for a guy?
Olivia’s real life was the one spent with Peter before he was erased. She loved him so much, she wouldn’t allow that life to be erased and replaced, and she didn’t feel like she was home or that she belonged, until she began regaining her real memories. Also, you’re stupid and you smell funny. Bye.

I believe you could not be fully erased because the people who care about you would not let you go. And you would not let them go. I believe you call it love.
I remember it. I remember us. I remember everything.
TAGS TAGS TAGS TAGS SO MUCH THESE TAGS.
Also I am still really uncomfortable with the whole “Peter never existed” thing because on the one hand I desperately want Olivia and Walter to remember him because it gives me way too many painful FEEEEEEEELINGS to have them not. But like, if Altlivia remembering Peter means she also remembers her son but doesn’t get him back and has to deal with the pain of him not existing, well, I don’t really want that. But I want the Altlivia/Alt!Lincoln development back because that was beautiful. I JUST WANT EVERYTHING BACK THE WAY IT SHOULD BE IS THAT SO MUCH TO ASK?