Maybe it's because I'm old, but I still don't understand why anyone would consider themselves to be "in a relationship" with someone they only ever interacted with online.
I mean, don't get me wrong, I've had online friends since the last century, but the people who got into relationships that way only considered them to be relationships after they'd met IRL. Not because of catfishing - we didn't call it that but were well aware of the possibility - but simply because, well, what would be the point?
A life-partner intimate relationship is just that - intimate, and a partnership. If you don't share anything and have never so much as touched, it's neither of those things.