My girlfriend and I are having trouble getting along?

my girlfriend and I have been dating for about a year. we used to get along like best friends with no fighting or arguing. now it seems like we are always fighting over something. it seems like the bad times are beginning to outweigh the good times and I don't know what to do. I want to break up with her while another part of me doesn't. what should I do?
My girlfriend and I are having trouble getting along?
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