<human>: Provide a brief overview of the text.

This is my first post, guys. I'm feeling really confused, so any contribution would be appreciated.

Long story - My girlfriend [23F] and I [21F] have known each other for about 10/11 years now. We were friends as kids then dated for 3 years beginning my junior year/her senior year of high school. I moved away to a different state and long distance ended up not working out. We didn't  talk much after our break up, because we needed space. 
Fast forward a year and a half and we see each other again and click. We've been back together now for only a few months. 
Before I moved away she met this guy at her college who liked her. It was obvious she was with me, but two separate occasions while we were together (one when I lived there and one when I moved away) he had told her he wanted to be with her. She had told me that each time she's stated that she only wants to be friends. I felt uncomfortable with him around.  
In our year and a half apart they have become close friends. While we weren't talking she would drunk text me every few times, "AJ this keeps telling me he wants to be with me, but I only want to be with you." Or something along those lines. 

So while we've been dating these past few months I have grown less and less comfortable with him around. All of December I let her know how I truly don't like him. I feel he's rude and hasn't respected our relationship from the beginning. She's told me to get over it, because he's her friend. On NYE, I gave her the ultimatum Its-either-him-or-me in my drunken stupor. Since then things have been strained. I feel like an awful person for wanting her to stop being friends with him, but at the same time I don't feel comfortable with him in our lives.
<bot>: Uncomfortable with her guy friend in our life. Want him out. Ultimatums suck, what should I do?