Does the 90/180 rule apply to an EU citizen in Switzerland?

I’m a Bulgarian national that is living and working in Portugal with Permanent Residence Card and would like to visit Switzerland as my SO is currently living and working there.

Does the 90/180 rule apply?

I’ve been applying the rule just to be safe, but I’ve never been stopped at border when I flew in (or flew out) nor when I entered (or exited) with my own vehicle.