healthy polyamorous: 3 people all in a happy relationship o/
unhealthy polyamorous: joe loves becky and jim. becky is not comfortable sharing joe with jim, but stays quiet anyway.
not a polyamorous: joe has 4 girlfriends. shhhh. they dont know.
THIS
This is important.
Healthy poly can also look like this: Zee is dating Buck. Zee is also dating Jade. Jade and Buck are friends and know Zee is dating both of them, but Buck and Jade are not romantically involved.