Hey sweetie. I am sorry. No matter how prepared you think you are, it still hurts to hear those words.
It isnt really new information, though, right? I mean he thinks he doesnt want to be married and has acted that way.
They often have to follow through with everything. Leaving you didnt fix the unhappiness, ow didnt, getting his own apartment didnt. So he feels that he has to try the next thing.
Often they say it and dont do anything about facilitating it. But sometimes they move quickly.
You dont have to answer him if you dont feel like it.
Trying to stop it just makes them dig in harder. This doesnt mean this is over, my friend. It just means he needs to do this in order to figure himself out.