Isn't there a mod for CK3 that does that?
Dunno. Don't play CK3. Will get it one day; I want to play Asians, good hordes, etc. even if the game is shit.
Autistic lets-push-this-to-11-with-needless-complexity:
Amor - The purely emotional and social level of feeling. Irrelevant largely in diplomacy with people you rarely interact with personally, decisive in the home. Built on personal history and personality compatibility. Old World is the best treatment of this I've seen in terms of that clever system it had where good men admire goodness in each other, bad men are comfortable in mutual vices and bad men hate virtue in men that shines a light on their own vice. Should be an engine of gay melodrama.
Amicitias - The political level of feeling, really just diplomatic alignment; more a number for the AI to evaluate in decision-making and to likewise be fed from the player a warning sign of intentions. Impersonal. Amor largely acts as a weighing of consequences on other people. The utility-maximizer may be self-interested by default, but where Amicitias is the consequences of the actions for the self, Amor is the part, merciful and vindictive, for others.
Fides - Loyalty. (EU4 calls this diplomatic reputation or something.) The bonds of trust conditioned on obligations instead of on convenience. One's overall reputation is a composite of Fides across their relationships. Its significance depends heavily on character; Honest-traited people will often act against their Amor and Amicitias because it is the right thing to do. Many a vassal hated his king and still didn't commit treason.
Stance - A way of acting that is adopted, from a list of options, that is constrained by Amor/Amicitias/Fides - one's lie has to be believable, and the better a liar you are, the more Charismatic/Deceitful the further you can push it - that acts as your signal to the world of intentions. You cannot observe these numbers raw. You can only know your history with this person, how they are acting, what you do know of their personality, how others that have dealt with them feel. Maybe Duke Backknifer really is ecstatic to see you at the banquet. The game will autoselect your Stance if you have it toggled on based on what's most useful, or you can delegate that to your Chancellor (he always has your best interests at heart, right?), or you can flag it for certain crtiical characters during crises.
Then for LOLs you add one for God since this IS the Middle Ages. I didn't pay much attention to it but I remember seeing the new CK3 theocracy DLC adds spirituality as a thing?
What I the player sees: "Oh, Princess Alliancesnatch now is Openly Warm to me instead of Disgruntled." (I like it when games add some fog of war to this stuff. Like not knowing exactly when the line will break in Total War, because there IS a real Morale number, but it's hidden behind bands of "Wavering," "Steady" etc. I don't WANT to be able to measure out how much gold it's going to take to get my reforms rammed through the Parliament.)