Yeah, this really grinds my gears as well. If the guy (or girl in your case) has someone and is flirting back, they should probably state they are with someone so I'm not wasting my time.
I don't do this, because it irritates me. I'm guessing if a woman does this, she might just want or like the attention.
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In my opinion, girls like to get some attention. So, when they see a person interested in her, she feels really happy about it. She doesn't want to ruin it by exposing the fact that she already has a boyfriend. Girls, they feel really happy when someone ask her out or tell her " I love you". It means so much for them, seriously.
Another option could be that she doesn't want to reveal her situation with her boyfriend to the public. By that, I mean she wants that the fact that she has a boyfriend remain a secret so no one will tease her on that because she doesn't like that. Something alike..
This is my experience: whenever I bring it up right away, the guy almost always gets defensive and turns around with: "Don't flatter yourself, I wasn't even hitting on you! Not every guy who talks to you wants to get in your pants!"
So I wait for him to do something completely obvious.
Hahahah, I don't understand what guys want from us. Some guys even get offended when we tell them soon that we have boyfriends. They say that the girl is being arrogant thinking that every guy wants her.
And maybe these girls are just being friendly to you, not looking to date you. Don't be offended because you've "lost a chance". If a girl is coming onto you sexually or asking you out on a date, and she never said anything about her boyfriend, then yes, THAT'S a problem.
Simple if you want to know is she has a boyfriend ask her right away :p
Because they usually get mad and say something like "okay, I didn't ask you that." So, I usually just look at it as making a new friend and wait for them to ask or say something where I need to let them know. However, every guy I told I had a boyfriend did not care and still continued to try to get me.
Scenario 1 -"So do you wanna go out some time?" -"I have a boyfriend." -"Wow, conceited much? Jesus I was just being friendly, no need to bring up you fucking boyrfiend, self centered bitch.
Scenario 2 -"So do you wanna go out some time?" -"I have a boyfriend." -"Wow you could have said that earlier, I just wasted my time with you. Fucking attention seeking bitch."
You see what I'm getting at? More often than not guys will complain that girls say it too son or too late. It's kind of our own fault. (well it's the fault of the dickwads who can't take a no actually but whatevs)