Polly

Okay so im actively being courted by a friend from college who just so happens to want an polyamorous relationship...(ikr) but me being me i willing to try it did i mention the sex was FAN-FUCKING-TASTIC...But neither my our friends or my mom knows that he and i are even a thing..and im defiantly not sure how they're gonna react when the find out about the polly thing...so does anyone have any tips on how i should tell them or if i should tell them at all