how to tackle jealousy during group sex

the best advice I got, which I thought was
insane at the time was to: sit with it.

put yourself in a situation where u will experience this strong sense of jealousy and insecurity and sit with it. it is a very strong force and it can drive you mad. but it is only because you are not familiar with it. it is just a thought and an imaginary threat.
so sit with it.

what do u think about group sex?