Yes, it’s possible to cheat in a polyamorous relationship.
But it takes a lot of stamina and emotional maturity to smile and be polite with someone that you don't have friendly feelings toward.
They are usually way less threatening and monstrous than I make them out to be in my head.
Many of us still believe in this concept that it takes a village to raise a child.
There are as many different configurations for polyamorous relationships as there are people on the planet.
People who are new to polyamory often want to know what the rules are.