I love My Boyfriends Best Mate And He Loves Me Back, WHat Should I Do?

Me And My Boyfriend Have Not Been Together Very Long But I Though Everything Was Going Okey. I Met Him Through a Friend. Now Me And That Friend Have Been Hanging Out Alot More Cause My Boyfriend Has Not Been Able To Come Out Much. My Friend Admited He Liked Me And I Like Him Back. What Shall I Do !!!