HR Isn’t Your Friend
You don’t just have to worry about office politics if you work in a company. Something they don’t teach you at school is that office romances happen all the time, even though they are technically against company policy. Still, that doesn’t stop anyone from getting romantically entangled with their co-workers.
The OP’s husband reported to HR about the drama that was unfolding before their very eyes, which had real-life repercussions for other employees. Instead of dealing with the parties involved in the office romance, the OP’s husband was told to get lost. So, snitches don’t just get snitches; they get fired, too.