In these type of relations I think the swedish language has a great solution:

• Sambo (tillSAMmans-BOende, “together living”, relatioship where you are living together)
• Särbo (iSÄR-BOende, “separated living”, relationship where you are living separated)

And there are all kinds of suggestions for extending this, the most common: mambo - living at your parents (moms) place. So just make up a suiting word for your living situation and add -bo.