He had her memory wiped because he still doesn’t know who’s targeting him. So whoever is trying to kill him is going to try to kill Lana(had they gotten engaged).
Not sure why she got engaged with the shitty prince but I’m assuming no one is trying to kill him so it’s an ok for the parents...
@knightnin He’s been looking for her ever since she left. In an earlier chapter he found out she wasn’t at the monastery her family claimed to send her to.