My boyfriend won't shut up about his ex's

My partner keeps talking about all the times he's had sex with other people (in his past) like what positions and where ect. Multiple time's I have said I didn't want to hear it (he knows it upsets me) but he still keep's doing it. When I told him kindly that I didn't want to discuss it, he said "Makes me wonder what I should and shouldn't tell you about my past." and he just started being a douche and made me cry. Am I in the wrong for not letting him talk about his ex's? How do I get passed this?

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