Jealousy is fomented from insecurity within.
To manage it, you have to know what that insecurity is.
Sometimes, that insecurity is triggered in childhood.
You have been on a few dates with this guy and believe the time is right to delve into more sensitive topics.
On your part, you have been open about talking about your previous relationship.
Perhaps too open.
Some guys are turned off when they discover that the girl they are dating has had a lot of boyfriends.
So much ego and negative assumptions are in line with this.
Why isn’t he your first?
You’ve had negative experiences with men or witnessed too many instances where men treated their partners badly.
It doesn’t help that you didn’t necessarily grow up around good men either.
You witnessed abuse or negativity of some sort while you were still in your formative years.
A shared interest is normally a good start.
When there is something that the both of you identify with, it is so much easier to form an initial connection.
It’s just like making friends in a way.