Why is she so hard on me sometimes?

I've been together with this girl who is gorgeous and very sweet.

I am a 16 year old model and I have many attention from girls, I always tell them to back off because I already have a girlfriend.

Me and her are very close, we talk about the future and living together and such things.

However, sometimes she is so sweet and loving and makes me feel so good, but then the other week when she has her period, she is so rough and sometimes mean to me, it hurts my feelings a lot, also because I know when its ''that time'' again and I know she's going to be hard on me.

She loves me a lot, but why does she have to be so distant and jealous about the other girls during her period?

I know some woman are really moody during it, but I'm so sick of being treated like that during her period, then once its over she acts really loving again, but during it , its really a painful time for me...

Why is she so hard on me sometimes?
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