Guys do this all the time. All he is doing is marking his territory. Just imagine him as a dog walking up to your ex's leg and peeing her, because that is basically what he is doing. There is no harm in it, unless it goes past the stupid email part.
He is probably just jealous that the two of you are still friends. And since your ex is still with him, I am sure that means that this will be over soon, and that he means no harm by it. There might be some reedeming qualities that he has that she doesn't tell you about.
He does sound like a goober, though.
__________________
You don't know from fun.
|