Bright,
Your h could have had a bad day or something was on his mind when he posted requesting the file. Trying to analyze his mood by the tone of his emails is difficult, especially when you aren't around him. Just be yourself when you interact w/him.

Again, if receiving his mail is bugging you, then do something about it, either advise him that he needs to put in a change of address and get a PO Box or have it forwarded to his friend's place, whereby it doesn't come to you.

You are the only one that has the power to change things that are going on in your life. Try not to allow his interactions bring you down.

You have been doing a great job. Don't allow others to convince you to file for a divorce. You'll know when you've had enough.

Sit quietly, the answers will reveal themselves when you least expect them to.
The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.