sorry you are hurting so much - like you I can pin point the start of this almost ot the minute. He changed on a dime. I accept it may well have been brewing for a very long time, but the change when it came was like a dam breaking.
You will feel better, but it takes more time - I am more than 5 years post bomb, almost 6 to the behaviour change point, and it is only in the last few months that I am really moving on, instead of going through the motions. BUT going through the motions is important, faking it until you make it gets you there in the end. It is a different time scale for all of us, but from what I have seen around here, it isn't uncommon for it to take 5 years to truly be able to move on, from a long and happy marriage.
I am now looking forward to my future life without my h. Not the future we hoped for and planned, but a different and full and rich one. After all, he might have got run over by a truck.