<human>: So yeah, like the title says... me (18M) and my girlfriend (18F) are going through a really rough patch. We've been seeing each other for over a year, and "officially" dating for 10 months. I know we're crazy about each other, and neither of us wants to break up. We've never really had any serious issues before. But suddenly, for the past couple weeks we've been fighting/arguing over just about everything. It seems like suddenly we cant be together without getting on each others nerves. And most of the time, its over stupid little things neither of use would usually get upset about. And I can't figure out why. I try to talk to her about it, but she just gets angry at me and tries to make everything my fault. So there's one problem.

Another big fight we're having is about this weekend. We were supposed to go out for dinner and see a movie on saturday. Last night she asked if we could change it to friday. I said yeah sure, but asked why. She told me another friend of hers (A male, who she knows I really dislike, wants to hang out. I hate him cause all he does is party/smoke weed, and tries to get her to do it. He's also such a dick to her. He won't talk to her for months, and then suddenly come out of nowhere and want to hang out with her again. Then he'll disappear again. Also, it kind of bothers me that he used to have a thing for her, and tried taking advantage of her once at a party.) So I tried bringing it up, and she got mad at me.

My question is, how do I get her to talk to me without getting mad? What are some suggestions I could make to help us figure this stuff out? I dont want to tell her she just can't hang out with him. I'm her boyfriend, but I can't tell her who she can/can't hang out with.

Can you summarize the given text in a few sentences?
<bot>: Girlfriend and I are fighting way to much. She just gets mad whenever I try to talk to her. Now she cancelled a date to hang out with a guy I don't like. What should I do?