arrogant aristocrat mmc who is also a rule stickler?

hey! i am looking for some more recs, this time around i was wondering if any of you know of a book where the mmc is the typical nobleman who thinks very highly of himself but on the other hand also cares a lot about his reputation? an ass who behaves like a proper gentleman, i guess 😭 if he has a relationship before marriage, it is a private affair with his mistress or another highborn woman, but he does not brag of it or publicize it in any way since he knows it is not done and does not want to expose his family to scandal. the only example that i can remember right now is from {eleven scandals to start to win a duke's heart by sarah maclean} which i read several years ago and loved