Lesbian sex on period

Had an argument with my girlfriend, because she was on her period but was horny. She went down on me and afterwards, when I was about to do that to her, she said no.. I was really pissed off, because for me it's important to make my partner to feel good. (I never accepted kind of "one side sex")

She said that we misunderstood each other and I shouldn't react so bad.

But I was really mad.. what you think about that? I felt like she used me and lied to me.

P.s. it wasn't our first time, we used to have sex on her period. She never agreed me to go down on her if she couldn't do that to me, when I was on my period.

So that's what made me feel mad.