Is it important for you to know about your partner's past relationships?

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To start- I know damn near everything about my boyfriend's past relationships and sexual encounters. We went to school together and I knew the girls he slept with or dated so I know a lot of details. However, my boyfriend does not know much about my past relationships or sexual encounters bc I didn't date around my school or our group of friends and was rather private about those matters anyway. 
We frequently get into discussions where he voices his discontent with "all the unknown". On the other hand, I am rather uncomfortable knowing so much about his past and am confused as to why he wants to know things like that about mine. I've told him how many people I've been with and that's about it- no need for names (he wouldn't know them anyway) and descriptions as I'd care to not remember them. I choose not to talk about it bc, quite frankly, I don't want to. So, I'm curious to see other people's take on this. How much do you want to know about your partner's past? Would you be upset not knowing much about it? Is it important for you to know?

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