You can be polyamorous with only one partner.
Being polyamorous means that you don’t place restrictions on how many partners you have and the partners you have don’t place restrictions on you either.
Your partners can be romantic or some variation of romantic or sexual.
It’s a form of ethical non-monogamy.
I’m polyamorous. But I only have one partner. I’m still polyamorous though.
Just because I’m only having sex with one person, and really only want to have sex with one person, it doesn’t change who I am. It doesn’t mean my belief structure is…