Hi palmtr33,
He always wants to know "whats wrong?" but cannot or will not accept my feelings and always blames me. Its got to the stage where I dread another confrontation, I always feel trampled. Is there a way of communicating effectively? Its seems impossible to have any meaningful conversations without being blamed for everything and anything.
this is a question that you can not answer. You are not his therapist - I hope he got one - has he? Any attempt to answer this question will be inadequate and perceived as invalidating. That then makes him more excited and less logical and boom! The best way to handle it would be a boundary - i.e. you commit not talking with him about what is wrong at this point in time. Find a short way to say no and prepare to leave the area if he does not listen. Check out the boundary workshops.
Communication in a relationship with a pwBPD at least for a long time initially should not be problem solving oriented but focused on emotional stability. This is not ignoring real issues but is moving everyone to a place where eventually real issues can be tackled. C. Stein pointed you to a good starting point.

,
a0