Sounds like she's desperately trying to preserve her image that everything is hunky dorey and there are no problems whatsoever in her family. I would NOT give Mom your new address when you move. Your XABF's comments about your new apartment being in a dangerous neighborhood, and insisting you give his parents your new address literally made the hair on the back of my neck stand up. Sounds stalkerish, obsessive and like a veiled threat. Just be safe, please.