Ok, little problem here. My current co-worker (former boss) and I run a team together of about 25 employees. When I was initially promoted to manager the reception was welcome, as we worked together well as Supervisor/Employee.
Now after about 8 months as peers, things are beginning to decline. I caught my partner talking down about me to a fellow manager regarding a simple mistake I made (which I fessed up to, and took responsibility for, then fixed). I confronted her about it, and she said she was "talking about something else". Not true, I heard what she said. Now, I realize that this can happen in a cut-throat world, however, she has done it in the past in front of both her and my employees. Not healthy.
I have asked her 2 times now to discuss these issues openly with me, and not anyone else, as I do look to her to as a more experienced, and may have a better point of view. The problem is that she continually degrades me in front of my staff and peers, is completely unprofessional, and has lied to our boss in the past essentially throwing me under the bus for a mistake SHE made. What do I do with this situation?
Oh, and by the way, I am absolutely destroying her team on productivity, employee satisfaction, morale etc. My boss has told me privately that I have done more in the last 8 months than any other manager in the last 8 years.