Someone else hits on your girl - what should be an adequate response?

My current problem is, i don't know how to react to a gf's flirtatious behaviour. She's 10+ years my junior and last weekend when we hung out in a sports bar watching Euro Cup qualifyers i introduced a frequenter guy to her. Something got into him right away, he started putting moves on my gf, all aglow, meaning to get physical. i would have easily thrown up in disgust right there and then but for the fact i'd come to the bar with that girl and was meant to follow through and leave there with her, too. i'm still of the opinion that she did all the provoking for that guy to approach, ie if she'd been wearing indifference no one would have come near. as i was saying i know that guy. most guys in the bar know me as well and when i thought i was beginning to look like a cuckolded fool to others i spoke to that guy to the effect that "you know dude, but that girl's mine" which seems a stupid blooper to make on my part. he went' like, 'no kidding? yours? i never guessed she was yours'. Long story short, he never quit that night and the most atrocious thing happened when he got out his phone with a triumphant gesture and asked her her #. i then started to dictate, but my gf interrupts for fear i was going to say an incorrect number and gives him her genuine one! A while later, i told her in semi-private i thought she'd carried things a bit too far to which she went that usual bs like i must be proud that my girl attracts male attention and she's not to blame for other men's lustful behavior blah blah. As a result, i faked a yawn and moved to another chair for a better view of the tv screen. Then she got loaded and took herself off in a cab. She texted and then called me in the morning. I wasn't much inclined to talk or text back, so she took a bus and came right over to where i work. I was disinclined to talk but the went at me with "you're a cheapskate", "you're a jealous Othello". I said no, i simply don't fukken care. i meant it, no kidding.

I really don't. But next time friends, there may appear a girl i do care about. Still i don't know what to do when someone else hits on a girl/woman you're with.

dont feel bad, just know it can be vicious but you can be even worse. its a farking jungle of hearts, life goes on.

It sounds like a mind game to her.
I have dated numerous girls. If her and I are strict, and a guy flirts with her at a bar, I don't even care. I take it with honor and find it good. However, if she went off giving her his number, then yeah I would be a little upset. It's a little damaging to the pride.
What you could say or should of done can be interpreted and discussed in many ways. However, the question is, do you really want a girl like that?
If she is 10 years younger than you, and I don't know your age but I am assuming she is in her 20's, majority of 20 year old girls are a little immature. Not all, but a lot I come across are NOT always the girlfriend material. They seek attention. They crave it. It's a question of if you want to deal with that over and over. It happened once, it may as well happen again.

In situations like that, I would of just taken control of the conversation. Read up on how to deal with AMOG's (or as Pierrot posted, watch the video).

Good luck buddy. Just remember if that is what you really want to deal with, or even have to sit down and explain why you feel the way you feel. I remember my most recent ex-gf, I would have to take an hour to explain why this or that she did was wrong. She was a few years my junior as well. (This was prior to me knowing what I do today), but it got so frustrating and disheartening knowing that I had to waste my breath to explain the obvious. I am not saying that she is wasting your time, all I am saying is you have to re-evaluate it on your own and determine what you feel you deserve or want.

If your game was tight enough and she knew you could game any girl and get their number, she would probably be more inclined to hold onto you and not try sh1t like that. I guess my advice is strengthen your inner game so you know that if something like that happens again, you can Bounce back strong straight away. Although, if it's a serious gf I wouldn't recommend fighting fire with fire in this way.

Brada the problem had the guy not known she is your gal would have been with the gal ,but since you told him the problem is with both of them ,what u need to do is stamp your authority tell her like you did ,that you will not put up with this ,as if guys cant control their lust ,was it necessary for her to give em her numberz .This dude is undermining you to you need to call his bluff ,when he bring his gf ,game her ,but unlike him dont ask for her numberz ,game her everytime as for the gal ,u need to up your game ,had you attended her ,guys would not have the oppourtunity to game her ,you should also give her a taste of he own medicine.

are you in a relationship with her? if she respected you and your relationship she wouldn't have done that.