Long story short, my mom (I don't even remember her age at this point) has been an addict for as long as I (32M) can remember. 

There has been plenty of times where she would strand my brother and I on the weekends when she was supposed to pick us up, leave us at school, sneak out of the house with her addict friends in the middle of the night, steal from the family, etc. The list is long. 

She went to Florida for rehab probably a little over a year ago, and I was totally fine with her being far away and starting a new life. At least that was the hope. She would call me every now and then and I would answer, even though I had plenty of resentment. I'd let her see my daughter around Christmas time, as well. 

Well, she's back around my parts and running the streets again, stealing, the whole shabang. Since then, she has made several attempts to wedge herself back in our lives as if nothing has happened. 

I've completely had it. I won't answer calls, won't go to a family function if she might be there, and will not let her see my daughter. I don't see her being any better of a mother now than she has ever been. 

I feel in my heart I'm removing a piece of cancer from my family life, but a small part of me still feels a bit sad about it. Am I the asshole? 

TL;DR: My mother is a life long addict who has tried to come back into my life, but I've shut her out completely. 