Hi and welcome.It sounds like you are most concerned about sharing a DID diagnosis with others and how they might react to it.
I was officially diagnosed with DID just over a year ago. The only people who know are my psychiatrist and my psychologist. I don't need or want to tell anyone else. So instead of worrying about whether others will leave or stay you could just not tell them if you want. Nobody needs to know if you don't want them to. I don't even tell my PCP. She doesn't need to know either.