This is the last time David and Saul ever talk. And while their parting was amicable, nevertheless, it’s clear that David did not trust Saul enough to return despite Saul’s promises.
Saul had proven far too many times that his promises could not be trusted.
That said, David treated Saul’s life as precious and forgave him.
When there is a pattern of abuse, I think it’s important to realize that while we are to forgive our abuser and not seek revenge, God does not require us to put ourselves in harm’s way.
It is all right to keep our distance until the other person proves that they have truly changed. And that takes time. Sadly, in many cases, that time never does come. It certainly didn’t for Saul.
So let us learn from David.
Forgive your abuser. But do not allow that person’s abuse.
Moment to Moment (Bible blog) 