Why is my girlfriend SO unbearable when she's on her period?

Anonymous
We've been together for 8 years now and lately she her periods have been hitting her harder than ever. Along with the abdominal pain she now has a fuse 1 centimeter long. I swear every conversation she starts is her assuming the worst thing about me.

One example: I carry a work shirt and a gym shirt (right after work i head on to the gym and change). As i was collecting both shirts in the morning she ask me "what are you doing with two shirts? thats your small shirt isn't it? (both were medium) your just going to the gym to show off your muscles girls huh?" so i spend a good 30 minutes arguing with her on crazy nonsense like this until the next conversation comes up.

so far its been a week of nothing but this. I seriously feel like moving out when these periods come. How do i calm her down before things get worse? she's really staring to become a bully when its that time of the month and its getting worse.
Why is my girlfriend SO unbearable when she's on her period?
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