Unfortunately, he claims to not check his email very often.
I could always text him and ask him to check his email when I do send him one.
In the past when he has responded to emails (if at all) it has always been one sentence. Very short. Doesn't always answer the question. Therefore, it's just as frustrating as talking to him, just minus the emotional reaction (as you pointed out).
I miss him. But the pain of being without him is better than a lifetime of anxiety and pain with him.
