Is it bad if i start seeing other people?

Me and this guy have been dating for about 11 months. We’re serious and exclusive but he’s super focused on his career and says he doesn’t wanna be officially bf gf because then it comes with an insane amount of drama. Anyway, I think that’s his insurance policy for if I ever have an issue with anything to be like “see this is why I don’t like all the relationship drama.” Anyway. Is it fair for me to start seeing other people. The issue is were exclusive and don’t talk or date other people. It would technically be cheating. But I wanna see if there’s someone out there to give me the attention I want without letting go of my original guy. What shall I do??????? And I wouldn’t be ok with him doing the same thing but idc. What would y’all do?