What is the meaning of a promise?

Fenrir walked, following her friend's instructions to find her target and checking Monica's habits and some interesting data. The hustler is surprised by the girl's impeccable academic and citizenship record joking that not even Lion had achieved a record as clean as the girl's.

Fenrir upon meeting the girl could see everything that annoyed and irritated him, an arrogant elitist who spoke with an elegant language and tone that revealed her great social standing. The girl mocked the noble waiter who waited on her by talking about how the poor man had made a mistake with the flavor of water she had ordered and that now her evening had been ruined because of the young man. Fenrir rolls his eyes, he expected to have some remorse and internal struggles with his conscience, but after seeing such a scene, he felt his conflicts died many before they began.

"Congratulations again lady Monica de la Coast!!!"