["That's terrible! I suppose sometimes things backfire, no matter how good our intentions are.", 'What happened?', "They tried to make out I was bad at my job, that's the last time I'll give somebody a heads up at my own expense again."]
Oh, no. That's awful! Did you report something that had occurred at your job?
I once told a co worker about an upcoming job promotion and they applied for it themselves, but also made me look bad in the process.