It doesn't matter.
We don't have a say in how people dump us!
That would be the ultimate controlling demand.
The person doing the dumping gets to pick how and when.
Your responsibilty is to accept it and move on towards healing.
If someone doesn't want to be with you hearing it in person is not going to make you feel any better about having your heart broken. "Closure is overrated" It's like asking to be kicked or slapped as they walk out the door. You don't need the drama!
The very reason your ex is leaving you could be the same reason Ms/Mr Right falls madly in love with you.
All you can do is continue to (be yourself) and let the chips fall where they may. Ultmately we are looking for someone who loves and adores us for who we are.