My aunt says she doesn't trust me. But she is proud of my sister, who's done awful things

My aunt has always preferred my sister over me. She says she feels like my mom treated me better than her and so she has always tried to step in and be there for Shawn.

My sister has an affair with our cousins husband. For many years. They literally only stopped because they started sleeping with other people. Not because it was right.

My aunt lives in this state of delusion about the affair. She thinks they stopped after she confronted my sister about it. Only they didn't. So in her mind, when the affair came up recently, she said I was bringing up old stuff that was “already resolved”

I think she's committed to misunderstanding me. My older sister also gets free babysitting from her and I have a kid too and I don't get that.

What she's done for my sister is never equal to what she does for me

When she said she will never trust me again, because my sister was pestering and I went off and told her “tell the truth that you're still fucking xxx” I'm like???? She's the one having the affair! Be mad at her.

But she's not. And every once in a while she will say she's “proud” of my sister for doing basic shit

Anyway, I hate this life