<human>: Can you condense the text into a few key points?

First post on this sub, so forgive me for my transgressions. 

For the past month my SO and I have been trying to figure out our relationship after I came to the conclusion that I'm not sexually attracted to him, and that I viewed him more as a really great friend (was on BC, got off because I wasn't attracted to him, and I'm still not). We were engaged, but after all of the conversations we've had, that is no longer happening. So we've decided that the best course of action is to separate and just be friends.

The issue is our living situation and our family/friends. He purchased a house while we were together, and my sister [21F] lives with us along with another roommate. Short and sweet, I can't afford to live on my own, and SO doesn't want us to move out for financial reasons (trying to find not crazy roommates, etc.) so we decided that just getting separate rooms will work, because we are still friends, and that has never been an issue.

From an outside perspective, people kind of view us as "the perfect couple", mostly attributed to our friendship as we are not overly affectionate in public. So this will be a super shock to everyone that isn't aware of our situation, and my parents love him, so I'm really afraid of them being disappointed. 

So now for the question is, how do people who still are going to live together (albeit in separate rooms) tell people we are no longer in a relationship? I've never been in a serious, live together, going to get married type of relationship before, so I don't really know how they end unless it's fighting, which we are not doing.
<bot>: SO and I are separating, but still going to live together in separate rooms, how do I tell friends/family?