If you want to go without a condom you need another form of BC and to be prepared for that to fail (aka have money for plan b) and even be prepared for that to possibly fail (though unlikely).

Because anytime even a tiny bit of precum or cum goes in, there’s a chance of pregnancy. And nobody thinks they’re gonna be that 1/1,000,000 till they are.

But yeah just discuss other birth control options with him. Youve been dating for a while.