I have been dating my current girlfriend for 6 months now 
She is a HB7 
She is my best friends sister

Relationship started off great as most do. Lately its been all arguing as i have been calling her on some things, such as her putting me down, texting other boys etc.

At first i was a little jealous that she was yexti g a close friend of hers (guy) but there was nothing to worry about in those texts and im okay with the guy to this day. it is her best friend and she was in a relationship with him before but he is such an AFC. She cheated in him. They remain friends.

Sidenote: she is not a whore and regrets so badly cheating on this guy. 

So just to make a point I am okay with her texting other boys if the content is appropriate.

BUT: Recently she has been texting a previous friend of mine. They are in a group together for a school project at the moment.
This guy is a nice guy, but a major AFC faggot.
This guy sabotaged my previous relationship texting my previous girlfriend very flirtatious messages. I thiugh nothing of it because he is unnatractive and beta as anything. 
He has been texting my girlfriend recently commenting about her bikini pictures on facebook winking at her, saying the reason he started talking to her was that picture, inviting her to parties, phoning her etc.
She brought this to me and said he is flirting with her, and i appreciate that. 
So i suggested we text him from her phone asking "do you have a thing for me or something?' He replied with no but i think your really a cool girl and i want you to come to a party so we can spend time together and talk, and you seem stressed, and i just want to be there for you" something aling those lines. What a faggot.
aaaanyways. 
I saw this text the next day and decided to call him as i was quite enraged at how he had her convinced he was just wanting to be nice. Obvious alterior motives on his part. I said this: " youd better stop texting my girlfriend saying she looks good in her bikini, and sending her hearts and winks, and trying to be there for her. That us not your job that is my job. If you want to get knocked out keep crossing lines."

Now i told my girlfriend i did this. She was a little mad, but when i questioned her she claims theyre nit even friends, i saw this as mostly him being in the wrong but i was a little on edge that she hadnt told him to stop. She didnt flirt back, but also did clearly not put him into his place.

I was enraged however, when i looked again and saw that she had told him that i had sent the text saying "do you have a thig for me" as we both agreed to send it. She stabbed me right in the back as far as i am concerned. 
cety disrespectful IMO.
I told her i was very mad she did that. She apologized.
 
There have been phone callsthat she says are because of the project but why cant you organize your group meetings over text.

I feel a little bad for yelling at this guy over the phone and not dealing with it in a more mature way.

So i messaged him this stupid ass message and went a little beta id say.

Heres what i sent:
Hey dude, I feel bad about yelling at you over the phone the other day.. probably woke you up too, I overreacted so I just wanted to say sorry about that. Anyways here's the thing: Its not your job to compliment Melissa and invite her to parties or try to comfort her, or any of that!! Trust me, she has those needs taken care of, because that's my job and I do it well for the most part. Also, I'm not here to ruin a friendship. You guys can hang out whenever and stuff, it's cool. I don't really mind at all now that I think about it.

Fastforeward a few weeks. 

I look at her phone and they are still talking frequently. I dont want them talking frequently like this with the previous content i had seen.
They are talking about how jealous i am and can see some pictures taken and sent of my conversation with the guy on facebook.

Also, she used to claim they are not friends, but when i called him and told him to screw off, she was upset because i apparently wrecked thier "friendship". Lied to me about them even being friends from the start so i dont know.

I have gone NC for three days and she has not texted me at all. She probably has texted other people frequently but cant be bothered to send me a text.

I have kept NC. I am going to her house today and telling her i am sick of her games and i dont accept how she carries on doing something she knows bothers me. I feel very disrespected that she continues.

I will go there today and tell her i want to break it off, that i am sick of her playing these games and that i am done. I will let her contact me showing she is willing to stop this, otherwise i am completely done.

She has said she will stop but continues.
I am done with drama in relationships.

What are your guys thought on my approach?
Thanks for any input guys!

Also didnt mention, sex has been harder to achieve lately than it should be. She should want to have sex with me but somehow that has been turned around.

You guys foukking suck.

You guys foukking suck.

Take a deep breath. Relax. Are you being cool? Or are you acting like a jackass?

I actually read through about half of your post, and then I got bored and tired. From what I did read, here's my take:

You're working way to fucking hard to keep this girl, and by acting like you did here because you didn't get what you wanted in the timeline you wanted, you're going to get your ass dumped.

My advise, tell her this stuff with the other guy is just too much drama for you, and you aren't happy to be in a relationship with her. She sounds like a decent girl, tell her you don't think it should be your job to keep other guys away from her and that the only way you'll do that is if she asks directly. Tell her she's great, and that someday if she can tell guys who are flirting with her or offering "support" that she doesn't need that because she gets that from her man, then maybe it could work between the two of you. Then freeze her out and start gaming other chicks.

If she's worth a shit at all, the games will stop. If she isn't, you just saved yourself more time and frustration.

P.S. I also suggest you work on your attitude and patience. I don't know you, but from what I read here, you're no prize possession. Not trying to be dick, just delivering a straight up message.

No man youre completely right, I do need to work on my patience. Thanks for the reply though, I appreciatte it.
Good advice on the self improvement areas, i have a lot of qualities i have built up from previous relationships where j was much more beta AFC.

with regards to what happened, it basically went the way you described with the advice.

Oh god. I am an AFC.