On the topic of who Tia should end up with, quite frankly, and obviously, Carsein would be...

On the topic of who Tia should end up with, quite frankly, and obviously, Carsein would be the best choice but unfortunately, they don't seem to have that chemistry and not much have developed from him yet. On the other hand, the Prince is still an ass from him constantly getting jealous in the beginning and acting quite arrogant, in addition to Tia's trauma of the past, he would never be a good choice. Allendis is unstable, however, and have issues but he has the most chemistry and bond with Tia right now, other than her father of course. His greatest mistake was the mistrust but it looks like they made up. So, I would still root for Allendis since he looks genuine otherwise. Well he's also my bias.