Why does he want to know if I’m sleeping with other people or getting any sexual opportunities?

This guy I’ve been talking to everyday and see every so often wants to know if I’m sleeping with other people or have been able to pursue other opportunities even though we’re not exclusive and he didn’t want a relationship at the moment. Why does it matter to him if I was or not? I know we have feelings for each other but having a relationship at the moment would not work out in either of our favours. We’re not exclusive and we’re “just friends”.
Why does he want to know if I’m sleeping with other people or getting any sexual opportunities?
Post Opinion