Ok, someone told me this spoiler so I'm not 100% sure since I didn't read the novel myself, but they will end up together, the prince loves Tia, in their past lives he was controlled and was manipulated by duke Zena, and also poisoned little by little, they make him believe things that were not true, things like: "your father doesn't love you, but he loves Aristia", or remember that he loved Aristia's mother (Jeremia) as if she was his mother? They make him believe that Aristia didn't care about Jeremia and it didn't pain her the death of her own mom, but the truth was that the trauma was so great that she didn't even remembered her, etc... They made the prince loathe Aristia since he was a kid, but as an adult they were already poisoning him, etc...
In this timeline a lot of things changed because Tia & Ruvelis interacted differently, and since duke Zena had Allendis (weed hair) in this timeline, his plan to use the prince as a puppet was not put into motion until just recently (at least this is what I understood)

So is there any hope for blue hair guy??
Please tell me there's and both are starting to fall in love..
Or i can't continue