Smooth23

So I've been going with this girlfriend for about a month now. Everthings great, lover her to death and I get that in return. I've got one thing that is kind of irking me though. I work a crazy schedule, and so does she, so we don't get to see each other very much, especially during the week. I was out of state all last week, and since I've got back I've seen her for a grand total of 1 hour. We figured out we would be able to have another few hours together one day before I had to work, and she then ended up making plans to go to a movie with 3 friends from one of her jobs. 2 guys and 1 girl as it happened. It kind of pissed me off that she would make plans to see a movie(that she's already seen) with people from work that she gets to see every day, then when I found out one of the guys was paying for her(apparantly as repayment of a debt) I just about lost it. It gets better though, whether she realizes it or not, the guy that paid for her is trying to get into her pants using the tried and true line of "I'm having girlfriend problems and thinking of leaving her". Enough of my long little rant, now I just need some advice. How do I get her to A. Stop hanging out with this one guy outside of work(selfish? yes, Neccessary? yes.) B. Realize that I've been adjusting my schedule with her all along, so she needs to do the same? Preferably all without seeming like an asshole.