I understand that dating together is pretty unpopular around these parts, but honestly I think it is a pretty hard rule for me. The more experiences we have, the more certain I am of that. I think it's possible that our relationship could evolve to include separate relationships, but that would be a long way off.
As far as involving someone else in our dysfunction, I agree that is to be avoided, but I don't think dating separately gets around that at all.
We already took a 1 month break for me to get my head together; I think if I asked for 6 months he would consider it stalling.
By people who are not appropriate, I mean all kinds of things -- people who are not interested in either of us, people who are not interested in poly, people who are in very dysfunctional situations, etc.