Bein Adam Lachaveiro needs the person’s forgiveness because untill then you did not rectify the wrong you commited. It is one deeply penetrating wrong deed, not two.
Mitzvos Sichlios are those Mitzvos which happen to make sense in our perspective as well as Hashem’s. Non Jews are required to maintain law and order for the sake of this world. Societal requirements are self understood. We are also required to do what is right, but that is a separate concept from Gezeros Hashem. That is why Middos, although they are meant to be learned and gleamed from the Torah, are not mentioned explicitly in detail.