Do you use these terms?

No, I don’t. I’m just not into relationship hierarchies.

I have a partner that I spend 3-5 nights a week with, and have been with him for a little over a year. I spend time with his son and we communicate daily.

I was in a LDR when we first started dating and for the majority of our relationship. I’ve since started casually dating other people.

I’ve valued all of these relationships equally and none of them have ever had more of a priority in my life.

Do you have any opinion about other people using them?

From my perspective, having a primary partner is a way to exert control because of insecurities about being “replaced” or feel threatened. Every relationship is different and play a different role in a person’s life. No need to create hierarchies.