Okay I'm at university, with a girlfriend who is in a town about an hour away by train who i see once a week, i don't have any intention on cheating on her, and am happy with the relationship. However i come in contact with hot girls all the time, and they present IoI's and i actually have interesting conversation with them. However i have to dismiss them or tell them about my girlfriend, but i notice they turn sour as soon as i tell them and act offended, or in one case, this one girl just gives me evil looks.

I want to be the Alpha male who has a hot girlfriend and loads of hot female friends at the same time, but it looks like I'm having difficulty friend zoning these girls.

Any help or advice would be appreciated.

This is a very tough problem too deal with that I had the same issue with a year ago when I was dating. What I did was tell them that even though I am taken I have a great group of friends that I know you would get along with us, come out with us this weekend. I'll use this statement so they don't feel shut down by me and so it becomes more difficult to say no too. You get to hang out with some beautiful nice girls and you hook up your friends and other PUA's! I hope this helps.