Essentially me and my girlfriend have been together for 9 months. It hasn't been a nice relationship as we have argued so much but yet we are still together and she loves me. The problem is another guy who she met at her old work has been making her "happier" and giving her feelings which i don't give her. She also told me that she may love me but she doesn't want to be with me because im too much work.

I was told by her, well i asked her for a chance that i will see her on Friday until Sunday. That if she doesn't get any kind of feelings towards me again we will break up but if she gets a small feeling then we will try to work things out. Essentially im trying to ask everyone here the ultimate question. How do i become irresistible to a girl who is 21 and loves me but has so many bad memories and arguments with me.

I know this is a hard one and all my friends have told me to break up with her now but im wanting to see if this can actually work and if i can become a better guy out of this situation. I was hoping for anyone to give me a crash course or help me to achieve this goal before this Friday. It may be pointless but any help will be thanked for.

As soon as another guy is on the scene, you leave.

i dont know about what to do there but let me ask you this:
how was your game/frame during the relationship? I mean if you put aside all those arguments and fights, where have you been between alpha and a wuss?
If your game was high and it is the fights that killed the attraction, which is normaly not likely, then you might have a chance. It is more of a question for you if you, having a good game, having many possibilities still want this bad relationship??

Else, if your game was weaker then it was her choice and it seems like this is beyond-repair or nearly-beyond-repair situation. Work on youself, inner game and shit, been discused 25582285 times, you know it.

If i understand correctly, you are quite fine and rational with breaking up with her?

And r.o. Has a good point