Spoiler
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I don’t think he ever knew about the sacrifice he says so himself, and when they were going to sacrifice the brunette girl he was really against it. I think it was more because as he said, he could never give her what she wanted. Which was a family and stability. Well, she never said she wanted any of those things, but he said she deserved them. When they burn her at the stake, he didn’t know who they were burning. He was just against it because he thought it was useless sacrificing the brunette girl Because he didn’t actually love her. When he found out who it actually was he Started screaming.
Finally, yes, brunette girl thought she was the love of his life. And well curiosity killed the cat so when she went to check the locket, she saw a small picture that he drew of blonde girl and her hair.
Spoiler...
From what I know part of the prophecy is he has to kill the woman he loves and ALLEGEDLY he knows this and also wants to protect him image/position so he never feeds in to it.
At the end basically the woman he's fake dating is due to get burned at the stake and Tite being crazy takes her place and John goes absolutely mental basically proving for the first time he loves her. Don't know if they reincarnate after that but that was an insane spoiler.
Also the girl he's dating thinks he loves her and not Tite but I think when he rushes cos he sees it's Tite burning and not his girlfriend a locket that has a lock of blonder hair and not her brown hair comes out ... So tea.
If anyone has any over spoilers lmk haha