The Seven Levels of Intimacy-
great book (not pertinent to poly per se).
It was a life saver for us-really helped lay out, in concrete terms HOW IMPORTANT metacommunication is in a relationship. How absolutely CRITICAL it is if you don't want to become a statistic (divorce).
You absolutely do NOT want to delay on this one sweetie. It's IMPERATIVE that you resolve the communication issue and make it a PRIORITY REGULARLY. WIthout that-the relationship WILL DIE.
A quote that stuck with me,
Either we're growing or we're dying-cause stagnation-is heading towards death.
Thats true individually as well as in relationship.
"Love As Thou Wilt"