Do I learn about my girlfriend’s past?

Whenever one of my girlfriend’s exes comes up I feel physically sick, especially since I have no exes and she has two. To be clear, she does everything right and I feel so loved by her. But, my girlfriend is offering to tell me about her past relationships only if I’m comfortable, and I’m not sure whether I can handle knowing everything but then I also don’t want to continue imagining worst case scenarios.