...wow. I am suspecting more and more that this new girl isn't the previous princess, that or she genuinely thinks that the saint title somehow makes her charming.
Tbf, if it is her, she thought it was a good idea to nearly kill herself just so she could kill the Saint so she likely isn't the brightest bulb in the bucket since the get go.
And I have this feeling that in previous life, the Saint's lover either took his own life or threw it away during a war rather than be without his love. I doubt he would date the constant reminder of his lover's death.