Pleasure to meet you!
Sounds like polyamory is just now beginning to be a "real thing" in your life ... Kudos to Bob who took that scary leap of faith over all the monogamous conditioning and fears that "What if she likes Joe better than me?" Kudos to you for being very patient with Bob; I know it must have seemed like a long three years.
I wish your trio the best, and hope Polyamory.com is helpful to you in navigating the bumps along the way. Congrats on meeting Joe, he sounds like a great guy!
Love means never having to say, "Put down that meat cleaver!"