Fuck buddy/FWB

So I’ve been sleeping with a guy I met on tinder for over a year now. We never really stated what we were but it just seems like we’re fuck buddies. We’ve never discussed what we “are” and neither of us know if we’re exclusive or if we are sleeping with others. How do I bring all of this up with him and ask him without scaring him off? The sex is great and I don’t want to lose it just yet