I think you should have closed the relationship out properly at least. Being abrupt usually hurts you in the long run. People develop all sorts of trust issues and ptsd so for your own sake maybe have a conversation but remember, nothing he did was a result of your shortcomings, it's always their own insecurities and mental health issues.

How can you make it stop? You can't. If she couldn't properly respect your grieving period, if she can't go a week without this incessant behavior, then it's probably a personality trait and not a fixable issue. It's up to you to decide what you'll do.