How to talk my mom about my WLW relationship?

So.. we are together since the beginning of this year but my mom have literally no idea about us. My parents are divorced and my mom was taking care of me before I moved to our new house with her. And…. She thought we were like siblings but… u know lol. If I call and just tell her ofc she wouldn’t react too bad but… she would act.. odd? by the way I’m bi, if you are interested

How to talk my mom about my WLW relationship?
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