Analyzer. It sounds like you're doing what your name suggests; analyzing, perhaps overanalyzing. You're doing the "He loves me; He loves me not" thing in your mind.
In reality, at this stage there is no way to predict which way a relationship will go. All new relationships are exciting and wonderful and we have incredible fantasies about the future. Most dating relationships don't end up to be THE relationship. You just have to wait and see.
In regards to whether or not you are just a "booty call," the only answer to that is do you have a relationship outside of sex. Does he share his thoughts, dreams, and activities with you or just call to set up sex?
It's really hard to tell if a man cares or if he just wants sex. Sometimes, we even get confused ourselves about that. I realize how unpopular what I'm about to say is going to be, especially on this forum, but when you jump into sex with a man you have no way of knowing if he wants more with you. One of my (female) professors explained it this way: "Men can separate love from sex. Women don't understand why you'd want to." As much as I'd like to tell you it's a new age and men and women feel and think the same way; they don't.
To sum it up, the only way you will know if you're a "booty call" is to see if he shares other parts of his life with you. I know that's not what you wanted to hear, but that's the best I have.