Never get jealous when you see your ex with someone else, because our parents taught us to give our used toys to the less fortunate. Yup, i need to remember that. Don't worry Katie, you'll find out soon enough that you are the less fortunate now.
This is why soooooo many relationships fail people, it's not being oppressive, it's being protective, of your relationship and your heart. If you really care for someone, you care if your relationship fails.