Why does my boyfriend keeps comparing himself to my ex?

Anonymous
Hii, so I got in a relationship 3 months ago, I really love him and I want our relationship to last as long as possible and to be amazing for both of us. He says he loves me too and wants the same thing.
But sometimes he asks questions about my ex, intimate ones. I try not to answer and I tell him that right now he's the one that matters for me and that I don't care about my ex. But he insists and asks even more questions, especially about our sexual relationships ("how long did he last?" "was he better than me?" and so on)
I've told him that these questions make me uncomfortable, nd that they make me feel like he doesn't believe me when I tell him that he's the one I want.
Why is he doing this?
Why does my boyfriend keeps comparing himself to my ex?
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