My best friend and I are fighting alot lately. What should we do? :(?

My best friend and I have been friends for almost two years and we are super close. Like I've never been closer to anyone as I am to her and we do everything together. We see eachother everyday at school and spend pretty much every weekend together. But in the last couple weeks we have been fighting alot over really stupid things. I can't even remember what most of them were about but the two I can remember were about boys. The first one I remember was our very first fight ever and it was because my boyfriend of one day had broken up with me but he didnt know it was her he was talking to and not me and I wanted her to tell him that it was her but she wouldn't so I said if she wouldn't I would and then we got mad at eachother and didn't talk for an hour then hugged and made up. Our last one was lastnight because we had spent the day at the mall with our two other best friends and her boyfriend showed up. They had just gotten together and it was the first time I had met him aside from texts. I was already a little mad because it was supposed to be a girls day for our friends birthday but then he started being an a$$hole and trying to take her from me all day and made fun of my slight lisp so I got mad at her later for not saying anything about it. We made up this morning bit we can't figure out why we have been getting on eachothers nerves lately. There will just be times when we will do things and we will get annoyed and start fighting and this has never happened before :( I just don't know what to do. Please help.