mesalenalas: Thanks so much for starting this thread!
I'm a bit like you in the way that I get a bit insecure about my lack of compersion and it's really nice to hear from people that doesn't mean eventual death of said relationship or that I'm doing this wrong.
It had been a little niggle in the back of my head that whilst my partner feels compersion for me (to the point he's probably more excited about my love life than I am), I have trouble feeling the same way for him. I still am happy when his like for others is making him happy but I can't quite get that excitement or rush like he does. It's nice to know that not feeling compersion can be somewhat normal in poly.