How do guys feel if you ask them about their past relationships?

So I am in a talking stage with this guy and I asked him about how many girls he dated he said he doesn’t know I asked what is meant by that and he said he took every relationship as a lesson and I asked I would like to know what you learnt or the outcome in those relationships if he doesn’t mind and he said he won’t and a piece of advice that I don't ask a person that type of questions and I told him fine I won’t. My main point is I just wanted to get to know him better did I say something wrong
How do guys feel if you ask them about their past relationships?
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