Why does he ask this?

There is this guy I talk to and everytime I talk to him he asks me about my boyfriend, and always compares himself to him. For eg - he said he doesn't do this with you as I right? And I am like yes but? Still he continues doing that? Why? What does he want? Sometimes he even asks how my sex life is with him, whether I like the sex with him.

Why does he ask this?
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