you dislike the price for what reason? that he acts like that to the MC? well, sad news for you, he is the culmination of so many reincarnations of his life so his actions without knowing his thought will look weird from the MC perspective, also blame the MC past actions, the ONLY reason she can’t just do what she did in his past lifes is becausw she knows how much cruel he is to his enemy's and how to deal with all of them since his experience
disliking the prince is stupid, he has all the reasons to do whatever he sees fit since he can’t seemn to finde the ending he wishes for
also the MC seems to be a big bitch to him in his numerous past lifes LMAO, any one that will force me to drink poison MANY TIMES will make me dislike them ever more!
also you seemn to forget something improtant since it’s not shown, but to DIE and experience DEATH so many times i will act like him too LOL