Drama at the Wedding

My mother-in-law spreads lies about me having contracted an STD during my sister-in-law's wedding. When I hear this, I want to demand an explanation.

However, my sister-in-law stops me and begs me to prioritize her happiness since it's her wedding. I hold myself back and wait until the reception is over.

Later, my mother-in-law merely sweeps the matter under the rug and say she doesn't remember anything because she was drunk.

However, the lies spread like wildfire. My neighbors scorn me, and my colleagues isolate me, treating me like a walking bacteria.