Hey guys, so basically before I met my girl she dated this dude (alpha male no doubt I recognize some of the shit I did to pick her up in the stories she told me) for several weeks but they never made it past kissing.

They almost took it seriously but she discovered the dude hooked up with another girl, so she forgot him as a potential boyfriend candidate.
They both remained friends though, and my girlfriend told me that they talked about there situation and it was clear that they were just friends.

Then she meets me. We date, get into a relationship.

However, this dude is still in her circle of friends, and recently they all went on a ski-trip for a week, during which - something I was sure was going to happen - the dude started gaming her again. The last night he was drunk and even told her he had feelings for her, etc etc.

I told my girl that I was pissed that this dude was chatting her up, and that it was a lack of respect for me, but she says that he isn't gaming her, and that I can't go talk to the dude or she'll get pissed off.

I'm kind of pissed off by the fact that this dude can get a free-pass on gaming my girl just because she likes him as a friend.

I personally don't believe in a male-female friendship unless its with your girlfriend. Therefore, I hate the fact that my girl has guy-friends that probably want to sleep with her, but I accept it.
However, if they are going to openly game my girl, I think that I should be inclined to say something.

I'm pretty jealous but don't show it too much, and my guts would tell me to go see the dude and tell him to fuck off, but I know this will piss my girl off extremely (she broke up with an LTR because he fkcked up a friend of hers that was gaming her).

So, how can I manage this situation?

how about showing her PUA material? If she recognizes stuff that he does, she might be put off by it. I hope this would work, unless he doesn't use enough material to get recognized.

So basically you have a girlfriend with a history of flirting with guys while in a relationship. Tell her she cannot be around the guy without you around, period. If she continues...find a new chick.

Use it against her, let her do what she wants n flirt away. Soon as she steps out of line then pull the " at least i dont flirt with other people line"....or if she cheats, which she likely wont, at least you have an exit strategy...

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dude, keep your jealousy in check and define boundries from a logical point of view.
my girl has an ex who she was friends with before they dated, then it went south and she dumped him. when i came on the scene i didn't really have a problem with him being somewhere out there but not really in the scene, she didn't go out with him or even talk to him so no biggie.
suddenly he sends her flowers and she accepts them. i nutted up, but tactfully of course. told her that it wasn't cool, and that men only sent flowers to a chick for one reason only.
when we do talk about it, i let her know straight up. you do whatever you want, but if you want to hang with him, and he is just a friend, then let me meet him, if you dont want me to meet him, there is a problem and i will be gone.
its not a bluff dude, you have to be willing to jet out if someone cant respect your boundries for one reason or another. you need to respect her boundries as long as they are not unreasonable and you having a problem with an ex getting too close is not unreasonable, but you need to be tactful and not childish.
trust your gut, dont badger her about it, and keep your eyes open. men are much more proficient at non-verbal communication so watch to see if her behaviour changes, but dude, really dont be a jealous prick.