I'm in a somewhat similar position and geographic location, though I'm still in my long-term relationship with my primary/life partner. She is monogamous, and we are working through my polyamorous feelings and the fact that I've recently added a secondary partner. It's not easy, but so far we've been able to move slowly forward. I'd be happy to field any specific questions, with the caveat that we're still working through things ourselves.
There was a thread for central coasters
that has had a little activity in the past month. I would love to see some type of local social activities for poly folks; it's difficult to make the trip down to LA or up to the Bay where much of the poly socializing seems to happen.