<human>: Summarize the given text in a few sentences.

I've had a really great friendship with a girl (Liz) when she started working in my department about 16 months ago. We're both goofy with each other, in and out of the office, and while I wouldn't consider her my best friend, we are definitely really, really good friends.

I found out today that I've been promoted, as has Liz. As a result of this promotion, I will be Liz's manager. She's really excited because she hates her current manager and her current job responsibilities, as she's told me this for many months, and I've been giving *my* boss (who did the promotions) many good words about Liz. I'm excited as well because this will be my first managerial position of my career.

So, riddle me this: How do I maintain my professionalism and be an objective boss, and not let my close friendship with her jade my management of and expectations from Liz? I also don't want our friendship to suffer!
<bot>: My really close friend and I both got promoted, and I will be her manager. This is also my first managerial position ever. How do I maintain our friendship AND be a good, unbiased boss?