Should I be mad. GF question

[Z32redondo]

EDIT: Ok so before you read this keep in mind that when i wrote it i was mad and I am not the "you did something i should be mad about lets fight" kinda people. I have a good reason why i shouldnt trust guys like these around my girl and this guy just comes off as a player. I have seen how he picks up girls all the time and do not know whether to take what he did as a friendly gesture or an attempt to make my girl one of those that he tries to pick up. Once again THIS IS NOT A SHOULD I BEAT HIS ASS OR NOT THREAD.

So tonight while I was at work my gf and her friend were hanging out with the club. Me and her have been dating for almost 2 1/2 years now. So one of my big army friends friends and her were walking around talking to people and there is this guy in a white SRT4 there. So my friend matt goes up to him and is like whats up my names matts and so and so. So he is like whats your name to my GF and she is like Cheyenne so he shakes her hand and tries to give her like a friendly hug and kisses her on the cheek. Now this guy is like a 20 something year old army guy. Ya know the type that try and pick up young girls and hit on any girl that they see. I know this because he has tried to talk to this one girl that is 16 and he is like 22 or some BS. So anyway my friend matt was like yo you dont need to be kissing my boys girl and all cause either i will whoop your ass or I can tell him and he will come looking for you so dont do it again (EDIT: he reacted like this because he knows this guy tries to talk with girls all the time and took it as an attempt to make a move). He was all like Im sorry that is the way we do it from where I come from. So my girl tells me and I drive off with like 4 of my boys and was going to confront him about it. I want to kick his ass just because im over pretective and shit like that about her (long story I dont want to get into). So now that I am kinda cooled about it I have been thinking.

Is it something that I should walk up to him all freaking on him or some shit (EDIT: That is if he made it more than a being friendly gesture) or is it something that I should just be like "look I dont appreciate you doing that to my GF last night and I dont want you touching her or talking to her anymore." (EDIT: which would be the mf GF really didnt like it and im letting him know that. Even though it was a friendly gesture from him)

I mean I am mad about it and by all means want to kick his ass (EDIT: was mad when i wrote this and was thinking it was the trying to pick up your girl Gesture) but would rather do it the mature way. Or semi mature way. I was thinking of saying what i did calmly and if he is like well what are you going to do about it, then going at it.(EDIT: which would be if it was more than a friendly gesture and his attitude is just like whatever) But i mean if he is like I am sorry and wont do it again like he told my boy when he said something about then its cool with me and i will walk away.( EDIT: which would be if it was just a friendly gesture and he understood that my GF and I didnt like it too much and that was the end of it all)

I just dont want him to try something again and think it is ok with me just because I didnt say something about it the first time. i know my friend said somthing to him but I dont want him to think i just blew it over and thought it was ok.

I know that it is acceptable in some countries and even with some cultures in this one. But my neither my GF, me, or even my friend know this guy at all and I just dont think he has any buisiness doing that. I am being like this because I think it may be an accident because they might really do it where he comes from but if he is trying to pick up all these girls and shit im just not really sure. Since none of us know him I dont think he knows me and my gf go out so I think it might have been him trying to pick up my girl or some shit.

But anyway im just here asking for a few opinions on the situation. And before people come in here saying like why cant you just be mature about it and walk away. I said I want to be semi mature and I will talk to him calmly and whatnot and try not to start something. But if he bows up at me like "ya I did that wtf are you gonna do" type of ways then I will throw down.

Advice...What would you do in my situation?