AITAH for telling my friend to cancel her wedding?

Throwaway because my friend group is on reddit.

I've (35F) been best friends with "Ann" (36F) since we were two years old (met in preschool and our moms became friends). We have a close group of friends, some of whom are married with children. Ann always talks about how she's jealous, wants to be a mom, wants the fabulous dream wedding, knight in shining armor, etc.

Ann has always had very abusive partners. After ending her last abusive relationship, she met "Dave" (38M). Dave is kind, funny, easy to be around. They are engaged to be married in April. However...Dave has a heavy addiction. Like, incredibly heavy. Addicted to porn, drugs, partying, etc.

I feel like Ann is looking over this because Dave isn't abusive - I'll often hear "he listens to me," or "he says he is sorry," and other bare minimum things in a relationship that I don't think she has experienced.

After a recent lying and relapse, I told Ann that I couldn't support her anymore. I'm often the therapist, and I feel bad but I'm so over hearing her talk about how his addiction is hurting them, and then a day later he's "so kind" because he apologized. I am no longer in the wedding party.

Our friends say that I am being an asshole, and that I should support Ann no matter what, because she finally found someone who is kind to her, and who she can have children with. Ann did not really listen to me when I told her I didn't want to be in the wedding party. She just said "I understand," and then changed the subject.

So...AITAH? If I am, how do I approach this with Ann? If I'm not, do I just stay out of their lives until the inevitable break up or worse happens?