Now i know this can sometimes be an easy excuse for a girl but what is a good response/ comeback to this? without just saying "oh ok" and walking away with your tail between your legs

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Anyone can be confident with a full head of hair. But a confident bald man - there's your diamond in the rough.
- Larry David

In what context do you get told? Mid convo? Early on in the convo?

"And I have a girlfriend, so what's your point? Did you actually think I was hitting on you? LOL"

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Before she can respect you, you need to respect yourself.

I usually take this as a point to be ballsy. You have to bring a presence to the words you say after though(Might not work otherwise)

Eg:

Me:Whats your name?
Her:I have a bf
Me:Thats a very long name, Hi Im **

Her:I have a bf
Me:I used to have one but then I went straight after...oh wait..

Her: I have a bf
Me: I have a cat, little shit lol

Just make sure she knows you know she has a bf, you just don't care an focus on the emotions/interaction with her!

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Live. Learn. Love.

Well i think being sarcastic helps. Girls like when you can turn and awkward situation into a funny one. You could say something like :

(This example i saw it done by simplepickup)

Her : I have a boyfriend
You: Is your boyfriend tough ? Look i am not a huge guy or anything but could he ... beat me up ?
Her: Yea (Most likely she will say yes)
You: That's fucked up !
Her: (Laugh)
You: You are suppose to be like i don't know, like stroke by ego a little bit.

(Conversation should continue from then)

Another options could be the following :

Her : I have a boyfriend
You : I think a beautiful girl like you could use two

Her: I have a boyfriend
You: How long have you had that problem ?

Good luck. - Zomboka-

If she says it out of the blue and in a rude way, reply with congratulations.

But generally it means she's not interested and move on.

A few responses to I have a boyfriend:

"Geez, you don't have to tell me all of your problems we just met."

"I had a goldfish once. Oh, I'm sorry, I thought we were talking about things that didn't matter."

"He can join us for coffee if he wants to."

"So do I. We should double date sometime."

Completely ignore her statement.

First off you can see if shes lying by telling her to say his name. If she hesitates, she doesn't have one, and you can call her out on her bullshit for laughs. If she does legit have one you have two options:

-Keep on sarging, she might not be happy with her boyfriend or she likes the attention, who knows what could happen.

or

-MOVE THE FUCK ON. I like this one better personally. Trust me, the amount of time you are spending with one girl with a boyfriend you could be spending with a single girl, who will be TONS more responsive to your flirty advances. Why shoot yourself in the foot?

There is none of this "Leave with your tail between your legs" shit. What? Your time is valuable, so why would you waste it? Literally the moment you know she's serious about her boyfriend you should get up, say "It was nice to meet you," and gtfo. You will find another girl.

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Two words: Carpe Diem

^This Great answer!