How to move on

So I recently had a client who was in a really combative relationship, and it wasn't an intimate relationship, it was just a relationship, a friendship. And there was a situation that arose. This person was taking as much responsibility as they felt that they could in terms of the breakdown of what had happened, and the other person wasn't forthcoming in terms of taking responsibility for their part in the breakdown, how they could have done better, what they'd like to see going forward. But the breakdown really came from the lack of taking personal responsibility from what had unfolded and their part in that....