NO. No no no no no no no. Why do you put up with this from her? Do you not have any standards for the women you decide to date? MechanisM's post was good but doing all of that is completely unnecessary. Do not put yourself through all of that.
While the issue here is the girlfriend, playing games with her will only end up with more and more games till she calls it quits. Does that sound healthy? She likes attention from other guys. I say that you should let her go be with them, break up with her. There isn't anything wrong with her liking other guys but you cant expect to take a girl like that and tie her down to you.
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she's always had a lot of guy mates but flirts with them a fair bit as just a joke
Yeah, jokes are funny bro. Wait, your not laughing though are you?
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dont understand why she has to be like this with other guys.
I know the rational side of you is trying to figure out a reason and a solution. There is none. You're not going to change who she is. No ultimatum or love poem is gonna change her.
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how can i stop feeling so horrid when she's having these interactions with other guys? And how can i give her all the attention she needs to stop her flirting with other guys so much?
Why? 5 months in and she is already THAT disrespectful? Sit down and really ask yourself. Smoke a bowl if you smoke or whatever, get in your happy place and ask yourself, "Where do you see this another 5 months from now?"
From what you've told me, I dont see anything good coming from this. She is accustomed to living this certain lifestyle and has no plans to stop regardless of how it hurts you. You're playing Mr Fix-it and losing sleep over it. Does this sound like something worth keeping?