How much should your significant other know about your past relationships?

In my own personal situation, I've told him about the abuse I went through because my ex put us in that situation, but that's it. I'm sure he'd like to know more, but I left it at that and so did he. Now, in my own curiosity, I'd like to ask him more about his past relationships. Is this too far? How much should each partner know in a relationship?How much should your significant other know about your past relationships?
I PRETTY MUCH LIKE TO GET IT OUT OF THE WAY AND LET THEM KNOW BEFORE IT GETS SERIOUS THAT WAY NO ONE GETS HURT AND IF HE JUDGES YOU 4 YOUR PAST THEN HE AIN'T FOR YOU!How much should your significant other know about your past relationships?
If you want him to tell you stuff, the best thing to do is to tell him. If you ask without telling him anything about your past, can you really expect him to be too forthcoming with his dirty laundry?
Nothing unless it's someone who could come back and do violence to you both.
yes

get ride of