Work Wife Term

So, I read a reddit post that mentions "work wife". I understand what it means. It means coworker you are super close in a so-called platonic relationship.
If you ask my opinion I'll say that "platonic" is just an excuse not to be excused as cheating. SMH. It's basically cheating. I saw someone mention most of them ended up fucking too?? And many people there (on reddit) are okay with it?? I mean there's a term called best friend but instead you call it wife??
I hate cheating so much that's why I'm questioning my existence here..
So I want to ask your opinion about this.