You should try and find out from her why she wants to know so badly. Maybe you can try and convince her that it isn't going to do either of you any good to picture one another with other people. sometimes people want to know for self destructive purposes or just to feel that they aren't in the dark about anything, but it really isnt always the healthy or smart choice.

My girl friend and I broke up for six months. During the time we were broken up, I had sex with other women. I do not feel I need to tell her about this, but she wants to know if I had sex with anyone else. We took tests for STDs when we got back together, so we are good there. I just do not think I need to tell her what I did while we were broken up. Thoughts?