I'm going to ghost my ex after his dad died
What makes you want to ghost your ex?
I'm doing it out of guilt
It's important that you're supportive of people who have just lost a loved one. You should be more respectful of grieving people.
I don't see the point.
You should not ghost your ex when he needs support the most. Instead, you can distance yourself a little but let him know that you're there if he needs you.