The DU Lounge

Before you read the letter, if you decide to, remember your sister has shown you who she is. Even if she says she is sorry (could happen) you have to put it into the context of strategy. She likely wants something from you or to unload something on you.
We get who we get with family. Often we invest so many of our own hopes and dreams because we believe family is forever--bound by shared experiences, love, and belonging. It hurts when those ties are shattered, and sometimes because of dark traits or mental illness.
It isn't your fault.
If you do let her back in your life set boundaries to protect yourself going forward.
My own mother was like your sister. She dropped me for 20 years when I married and had children and spread all kinds of nonsense around so she didn't look bad. I always deserved her bad treatment. She loved adventure and excitement and no responsibility. She squandered our family inheritance from her parents that was meant to be generational. She did it because she could and she would get reckless ideas. She wanted to be at the top of everything. She was very narcissistic and bi-polar.
My sister called me to visit Mom because she had dementia and wouldn't remember me. I went and saw her several times. I was able to forgive her and let it go.
I now have a grown daughter very much like her. I love her, but she is reckless and I suspect also bi-polar. She gets angry if I bring up seeing a doctor or therapist for any reason. I include her in family things, but all of us set boundaries so she doesn't cause harm or hurt.