If he isn't on medication...you are in for a very rough ride.
I just escaped from such a relationship... it was the worst experience of my life (lasted 10 months). He believes he is the only smart, whity, sane person in the world...everyone else is both stupid and nuts. Yet, his view of events is total fantasy. Psychosis indeed!
He was getting worse and worse... the explosions were every other day at the end... I had to escape
If doesn't promise to be on meds...and STAY on meds... RUN
If he breaks that promise.... RUN