Just been reading a couple of articles about this. It’s basically when, despite being in a serious relationship (i.e. it’s no longer early days and you could-habit), barely anyone in the wider world knows it exists. For example, if your partner regularly posts on social media, not only do they not disclose their relationship status but there’s no posts of you together or mention of you in any of their posts - and if you make a comment they don’t respond. You may as well be an old school friend they’ve not seen for years. Most of their friends don’t know you exist, and the (very few) who do you never socialise with or get officially introduced. And whilst their parents might know about you, you never actually spend time with them.
Most of the articles make out it’s a bad thing - that it shows your partner doesn’t really respect you enough to put you before others who they fear may judge. Or else it’s a way of controlling you. Whatever, it’s not healthy.
But then I thought of someone I know who behaves exactly this way. And they seem to be fairly happy. Both are older divorcees with young kids and I think it suits them to be invisible to each other’s social circles - each would be happy to stay at home and do their own thing whilst the other goes out with their family or meets up with friends. They can be as antisocial as they like. Plus, I imagine in keeps an element of clandestine romance alive.
I couldn’t do it though. What about you?