My girlfriend uses her period as an excuse to be horrible to me?

Before I start off, I just want to say that I do appreciate the amount of pain you girls go through each month.

However i feel that my girlfriend uses this to her advantage. She'll tell me to fuck off even if i haven't done anything, she'll knock my things over and she'll tell me to sleep on the couch... and she always says it's because she's on her period. I'm not one to bang my own drum but i'm really supportive to her during this time; i give her back rubs, make sure she has a heating pad and if i have to, i'll buy tampons for her but i just feel like it all gets thrown back in my face for no good reason. Girls, are these lashouts valid when you're menstruating?

My girlfriend uses her period as an excuse to be horrible to me?
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