@Afiaki
I believe it is the former fiance - the one whom the doppelganger wanted for herself and caused the whole death, face mutilation, vengeance arc. He ultimately decided to move away from said doppelganger due to change of character. But FengFeng still does not want to have anything to do with him because:
- she's a different person (literally, reincarnated, this is an isekai, remember?)
- she kind-of got pissed off at him regardless and never got over it really
- she wants to get into Lord Hell's hot pants