Happened to me four years ago, We had been together for 24 years. He woke up one morning and within ten minutes he was gone, No talk, no reason, no explaination. He literally got out of bed, started packing a bag and got in his car and drove away with me looking confused at the door. He blocked me on everything minutes later.
Still depressed and feel like I never want another relationship again as I will never trust anyone to that extent again. I almost took my life at one point.
I miss what we had, the life we had etc, but I no longer miss him and I wouldn't have him back.
Worst thing for me was/is the constant loop of questions in my head.. why? what did I do? why couldn't he have sat me down like I was a human being? How could he love me for so long then hate me overnight? Was it something I said? Did I do something to hurt him without knowing?
Took me three and a half years to stop thinking about him/us, I still to this day wonder why he left and if I think about it too much it sends me back into feeling depressed.
The first time in all our years together he hurt me, Which makes it harder. He too turned overnight into the coldest person, his eyes were dead, they way he looked at me it was like he resented the fact I existed all of a sudden.
Cry if you need to, just get it all out, watch mindless crap on tv to distract you, Talk to other people online or friends in real life, family if you have one, Try to find a new hobby or something to focus on.
Nothing really helps at first, but as time goes on it hurts less and you find yourself thinking about them less.
Keep telling youself that is he can just up and leave you without so much as a goodbye then he isn't worth your time thinking about him. He did not respect you, and neither did mine.
I went through a phase recently of dreaming about him, it happened everynight for a week, I had a dream he was standing at the alter in his wedding suit telling me how much he loved me, it really does mess you up.
I know a lot of people on here say people can leave a relationship for any reason, and that is true, but at least have the decency and backbone to sit your partner down and tell them it isn't working out anymore or whatever. this has been mental torture and I did nothing to deserve it, All it would have taken was 'I'm leaving because I'm no longer happy' rather than just leave and block me without a word.
If you need to talk then feel free to pm me, I know how you are feeling and its horrible.