People who have unfriended their childhood friend/best friend, what happened?

My childhood best friend is like this too. She was awesome when we were kids/teens, but she struggled with undiagnosed borderline personality disorder and alcoholism as an adult. Since her diagnosis, she's worked really hard to learn and manage her disorder, but continues to drink. She's such an asshole when she drinks. Even when sober though, I just find myself enjoying her company less and less. She's so funny, but at some point in our hangouts she'll start to cross my boundaries. Every.single.time. She definitely thinks she's the main character main character. I love her, but man I don't really like her. I'm trying to put some distance between us, but she's working harder than ever to reestablish our friendship.

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