I hate my sister in law

My sister in law knew about some dark secret between my husband and I. Her husband had to be involved due to circumstances.

She cornered me and pulled it out of me. Then told me it made her feel better about herself. Told me the family would be better off without me and basically made me contemplate taking my own life.

Then as an apology she told me I damaged the relationship and we were no longer best friends but she’s glad she could get over what I said.... 🙄

We haven’t seen each other for months. Interaction has only been through a family chat.

We have to be to a family function together soon. I hate her. I hate her. I hate her.