For “fidelity” see “trust”, cheating on your partner must say something about how trustworthy you are and how likely you are to keep any vows you make like the ” Oath of Allegiance” for example. Or do we just accept everything and anything MP’s do or say?
You “trust” an MP?
No no no, just try to put them where they will do the least damage until they become a liability, then get a new one in & repeat.