Hi jam, sorry for what you're going through......
Anyway, are you 100% sure there are no signs or anything different before he stopped communicating with you?
Sometimes we only see what we want to see.....
As you know, not all signs are bad like fights, tampo and all sorts....
sometimes its the other way around...... when he is extra nice than usual,
that can also be a sign....he is actually preparing for a good exit...
then he will just vanished...but that's just my opinion