Dear Annie: If you had told me five years ago that I would fall in love with my ex-boyfriend’s brother, I would have laughed you out of the room. And yet, here I am.

I dated “Mark” for two years. He moved into my home, and even after I ended the relationship, he stayed another six months because he had nowhere else to go. He is an alcoholic who can be charming one minute and emotionally and verbally abusive the next. Over the years, he has burned through nearly every relationship he has had: friends, coworkers, even his own parents and brother.

During that time, his brother “David” and I stayed friendly. Our families have known each other since childhood. We went to the same birthday parties, the same school events and even ended up in the same friend group as adults. He has always been

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