Yusei Fudo

I had to do 3/4 of chapter 4 like 3 times but in the end I managed to pair Sylvia with Claud and Lewyn with Eirinys! Thanks!

Hi, I need help with a pairing, I'm in chapter 4 and I just conquered Silesse, I saw that Sylvia x Claud and Eirinys x Lewyn conversation didn't trigger because Lewyn is paired with Sylvia, but I want Lewyn with Eirinys and Sylvia with Claud, I read that killing the wrong lover erases the love points but that's not true, in Lewyn's lover it's still written "Sylvia". Is there a way to fix the pairings since killing Sylvia doesn't work?