All we have is now!
You only have today along with only having this very moment. You did all that was in your power to do regarding the incident and that's all that matters; you did your part.
Take a second and breath. Focus on one day at time; so simple yet we seem to make it that much more complicated.
Regarding your situation with your ex: "relationships can be a terribly painful area. We tend to fantasize and project what will happen. We get angry and resentful if our fantasies are not fulfilled"