Girls in relationships to this to me alot.

I'm not sure what makes me a viable target for this. They hide their relationships for weeks. I don't know if they do this to unattractive guys. If you ask them out they don't say they have a BF. They say maybe.

I don't know how to spot them, I'd like to avoid them because it's never been a good use of my time to flirt with them. Sure I shouldnt be outcome oriented but I think they're annoying. Like there's no way for me tell and you have to escalate and fuel their ego. They will practically beg for attention just so they can say no I honestly can't help but dislike them.