If you want to change the relationship then you have to change your behavior. Talk is cheap, and action will do the trick.
Don’t see him for booty calls. Only agree to see him if you’re going to dinner, a movie or some other date like activity. You can have sex with him AFTER a date, but ONLY after a real date.
It’s really that simple. You’ll find out if he’s interested in you for more than sex pretty quickly this way.