I don't recommend trying this. If he can't be loyal and happy then tell him to leave and go be with all the women he wants. He'll be single again with an emotionless life. Have you noticed how the above statement shows him wanting control of who you pick? In order to be in a polyamorous relationship, the pair has to be willing to give up on all possessiveness and jealousy. Stand your ground and don't compromise your principles or integrity - you're worth more.