If you were going to offer one bit of dating advice, what would it be?

Yikes! Ummm. There are so many directions I could go with this.
If someone says that they are going to hurt you, believe them. Run away. It is a terrible excuse for bad behavior and it should not be tolerated or accepted. The chances of “fixing” someone like that is beyond rare. So, like I said, run away.
And that is officially the first time I have written any dating advice.