My white boyfriend [27M] whispered the N word in my ear [23F] during sex.

Long story short, we've been together for 3 years now. He's been really sweet and caring the whole time. We really never talked politics or anything like that. Yesterday we were making love and he whispered the N word in my ear as I climaxed. Once I regained my composure, we got into a big argument. I have not talked to him since. I am feeling a lot of conflicting emotions rn. Any advice?

EDIT: Stop jumping to conclusions. I will not end my greatest relationship so far over a word. I doubt he's racist when he wants to have kids with me. No klansman would "dirty up" his genes.