I haven't read the novel but at the start of manga it was clearly mentioned Romantica was Desir's lover in his previous life, so i had automatically accepted them as couple. So him ending with Adjest seems uncanny to me. Him betraying his previous lover and getting off with some other chick...
I don't, I cannot like Bertia after this chapter. I don't hate her, she cute and selfless and yada yada.
Honestly, think about a second Bertia herself is no good for becoming a queen(not that I am saying Heroina is good). She is just like any typical Mary sue shojou heroine,
"Ah, I am selfless...
The story at the start showed good potential buuuuttt
now it has turned into cliche shoujo trope, fl is not really likable .
Or you can say it is the reverse perspective of the villainess genre.