Need advice for boyfriend mother

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My boyfriend’s mom has been acting like a bully towards me for the past few years. I have sat down with her & talked to her about things and have even texted her directly to solve issues she’s had with me. None of those times got through to her. I was naive & thought that no more issues would arise.

The beginning of this year, my grandpa got sick all of a sudden & was in the icu on life support. I was devastated. But I had to keep my head up, as I was also trying to finish college, in school to be an emt, & applying for nursing schools. I would go over to my bf’s during that time to get relief with obviously a lot on my mind, but his mom would tell me I’m depressed & sad to my face multiple times. I was upset, but I had too much on my mind to care.

Anyways, it’s the end of the year now & I’m finally not as stressed. It’s come to the point now where his mom is actively ignoring me when I’m over, talking bad about me behind my back, and giving me harsh looks all the time. I don’t even feel comfortable going to the kitchen to get water by myself anymore. My bf has tried talking to her but she doesn’t get it nor care. It honestly feels like she’s bullying me. I was bullied all throughout middle school and high school & I feel like I’m reliving that moment. Since nothing is getting through to her, I’ve decided to treat her as one of my bullies. I’m going to act like her words don’t hurt me, show my confidence, & be polite yet firm. I’m hoping when she sees that her actions & words don’t hurt me and is not getting to me, she’ll stop. Maybe this isn’t the best thing to do for everyone, but my bf & I have honestly talked to her so many times and I just am done trying to solve things that way. I just want to know if anyone else has been through this & what you did? Any other advice? Thanks!