Don't be upset if he has already filed. Be careful about saying things that seem as if you are in control or in charge of the matter. Just maybe say, we both need time to cool down and it's not wise to make decisions when everyone is emotional. Always try to make it sound like you are doing it for him and not for you.
Then concentrate on friendship. Keep in mind, if he's pulling away there *may* be someone else. However, if he didn't initiate divorce talk that means he's in limbo. It's a good thing. Stay strong and PMA. Be his friend even if he has filed, be supportive no matter what. You have to always stay on the "high road" regardless. Doing this you won't have any regrets.
Also, be careful about pursuing. You've called him and left him that info... now let him call you back when he's ready.
There is no arriving, ever. It is all a continual becoming.