How long does the honeymoon stage last?

I've been with my bf for more than 2 years, the sex is great, our families are close, we barely discuss, we are more in love than ever, and I'm just scared, I've just got the feeling something big and bad is coming because there has been no drama yet... Is it crazy to think this way? Sometimes I tell myself it's the honeymoon phase but I don't think it lasts more than 2 years considering our age (both 20)...

Or maybe this is just bullshit romantic comedies told my brain. 😂 Idk. Help?