Is my girlfriend using her period as an excuse to express her true feelings?

My girlfriend is fine most of the time but she'll spend about a week saying mean things and outright insulting me and not even let me touch her but then will ask me to forgive her because she says she was on her period. We've been together about 6 months and she started doing it about 3-4 months in. Is she telling the truth or trying to get me to dump her?

Is my girlfriend using her period as an excuse to express her true feelings?
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