@Rezef Basically since Ines chose Carcel to marry that made it difficult for the CP to have Ines as his wife. Previously married women aren't allowed to marry royalty. So the only way he can have her is to make her his mistress. However, the CP can't make her a mistress if he doesn't already have a wife. That's why the CP has a fiance and that's why he's tormenting Carcel/trying to get rid of him. So he can make Ines a widow/divorcee and force her to be his mistress. (Please correct me if I'm wrong on anything.)
@WiggleTruff no you are right. That guy is a lunatic. Even when he was married with Ines, he slept with men and women and made Inès lose her child with MST love you my a**