Retroactive Jealousy

I read some Questions and Answers about the retroactive jealousy. Most of the time I read of cases where who was jealous used to ask details about the past relationships. My case is different, sometimes she brings up stories regarding her ex-boyfriends and this hurts me. Once she showed me the picture of his last boyfriend, a few weeks ago she told me the story about another boyfriend and her friends.
A few days ago she started telling me all her past experiences she had, I was surprised and upset but I pretended indifference. I don't know what to think. It's 8 months that we are together and I love her and she loves me, but why she tries to hurt me.

Maybe she did not want to hurt you but needed to talk. Ask her to talk to her friends or a psychotherapist about former boyfriends, but not to you.