["I didn't get the promotion I wanted, even though my boss said it was virtually guaranteed.", 'Oh no!  Did he give you a reason why?', "Nope!  I think he's avoiding me.  I went through three different interviews over two months and he was positive about it the whole time."]
That's terrible.  Have you said something to HR about this?
I didn't get the promotion I was going for, even though my boss said it was virtually guaranteed.  I went through three different interviews over two months.