I've told my mom, my son, his mother, and my complicated relationship. I sent the last one a link, and it turns out she was already a member, for the Family Support forums.
I feel it's important to be open about my struggle, especially with my (ex-?)girlfriend, who suffered the most from my addiction. I don't know if she reads here or not, but that's not realm germane. I am here for me, not her. I am in recovery for me, not her.