Did he tell you that those are the reasons he is divorcing?
Have you asked him what happened a month ago?
Do you want to be with him?
There's no reason why you can't contact him either by email or calling. Try asking him out for coffee if you are comfortable talking about it face to face, its always best.
Let him know what you've told me, that you were both under a lot of stress, and things were said that were not meant. Let him know that the two of you have a lot of history together, too much to just throw away and tell him how you feel about him. Its not very often you find someone to love, someone who you consider a soul mate, and to just let it go because of a one time argument. If he says no, then at least you know where you stand, but you'll never know if he'll say yes, if you don't talk to him.
I welcome your thoughts, let me know if you want to talk more.
When someone cuts us off, with no reason and no explanation, you can only assume that they have lied in some way. Perhaps he has gone back to his wife or perhaps there's someone else in his life. What people don't realize is that it is possible to love more than one person. So while it is very possible that he loves you, he may also love someone else. The argument may have been incidental, an excuse to end the relationship, rather than the cause of the relationship.
You may be right, and time will certainly tell. I'm here anytime you need to talk. Feel free to ask for me by name. Good luck with everything