The grey area is the path we step on when we loose sense of who we are. We go towards the opposing color when our partner is having doubts about the relationship. Grey is the change (or lost in posture) in an attempt to win back our partner.
Our partner felt in love with black, not grey. If we loose the sense of who we are by going into grey, it will push our partner away.
What we need to do is figure out how to be black again. Figure out who we are and stay true to ourselves and pray for the best.