There's many theories what the "forbidden fruit" in the paradise actually was, and most scholars agree that it was unlikely to be an apple (just as Jesus wasn't white). One theory is that the fruit tree Eve stood below was a date palm.
Which means that basically Adam & Eve got expelled from the paradise because they had a date and God hadn't. Would a triad relationship b/w the three have fixed paradise? Why does monoamory and envy always ruin things?