There's nothing childish about wanting someone to care for you as much as you care for him. Unfortunately, it sounds like he just doesn't, or he'ld be around more than just once a month and you'ld hear from him in between dates.

This is hurting you. At some level I think he knows that. It sounds like you're security for him - a reliable admirer that he can turn to, until he finds the partner he would really like to have. I think you have the right idea in making yourself less available to him.