<human>: Can you condense the text into a few key points?

Hi everyone,

I met a girl when I was in Korea. We dated for 3 months. Things were just awesome.   
I had to come back to my home country to get a visa. It took a fucking long time, 3 months. 
During this time I kept contact everyday with her.
I came back on January 6th (last monday). Since then, things got very complicated. 
She basically told me shet met a guy at a christmas party. And that she's into him. 
They are not dating or whatever, it's just in her mind.
Now we continued to date together, I tried to get her back. We had sex 4 times last sunday and things were great.  
But she's still saying that she's into this guy.

Now I asked a good common friend for more information. She told me that the other guy is just a brat. And definitely can't compete with me at all. She doesn't get it. The guy is a student with no money, no job, from what I've heard he's not confident at all neither, etc.    
Even my girlfriend told me that he's like a little dog. Very docile. (girls like that now?!)  

Thing is, it hurts my pride. I really loved that girl. I don't know what I should do. I guess I should take my distances with my girlfriend, cutting contact, and let her think about us? That she may be doing a huge mistake?    
I'm pretty sure she was just feeling a little alone while I wasn't there. This guy was just there at the good moment.
<bot>: My girlfriend is into another guy she met last Christmas. They are not dating at all, it's just in her mind for now. What should I do to get her back?