Should I lie to my girlfriend about my vote?

I voted for Trump and my new girlfriend is super progressive and anarchist on Twitter, retweets black women and says stuff like "f*** the police."

She asked me who I voted for, and I said Trump, and she threatened to break up with me. I told her I was just kidding and that my vote was "private."
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She constantly makes anti-police and anti-systemic racism comments and I often argue like a madman or stay out of her bulls**t by just saying "okay, that's a good point" laughing along. I feel a bit comfortable, but I will introduce her to my family and they're kind of uncomfortable with anti-police and anti-white privilege comments.
Should I lie to my girlfriend about my vote?
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