My girlfriend thinks I am cheating on her?

My girlfriend always thinks I am cheating on her, I honestly don’t know why. She always argues, always stresses me out. The course at university which I am doing has a lot more females than males, so I have a lot of friends who are girls. Whenever I go to parties, clubbing, with my friends, she raises hell the next day. None of my friends spread rumours about me to her, it’s the same thing with her friends. I tried talking to her, I tried talking to her brother. I feel like breaking up, I can’t carry all this weight on my shoulders at the moment.
We don’t have to be around each other all the time, I need my space too, and I let her do the same

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