I was with my ex husband for 10 years, and over I'd say the last 3 of them, we had very little to do with each other.
We went through the day to day - went to work, came home, silently watched TV and ate and then went to bed. There was nothing that resembled a relationship/marriage left.
I moved into the spare room 4 months before I moved out, but I'd say our marriage ended really gradually over a period of time and then one day it was just really, really clear that there was nothing left to fight for, and anyway - nobody wanted to.
We'd had lots of conversations about where we were, and why we thought that might be the case, then one day he came in from work and told me he didn't love me anymore, and he wouldn't be able to bring that back. To be honest I'd known that for a while deep down.
That year was genuinely the worst of my life, I'd be very surprised if I have any tears left. At the time I was getting 2/3hrs sleep a night and must have looked absolutely horrendous.
There was a pretty long period after we separated I thought I'd never be happy again. But I've been with my new partner for almost 3 years now, and that couldn't be further from the truth.
Honestly think when you know, you know. We both knew really, he just ripped the plaster off, and in the long run - it'll be okay.