booty call girl?

I’ve been seeing this man for nearly four months. He works in a bar that I used to frequent and one night I stayed there until late, all the people left and we were alone. Before all this happened, he was always flirting with me, smiling at me and I knew he liked me. That night, when I stayed there with him, we started kissing and we didn’t stop for another three hours. Nothing more happened, and then he drove me home. He asked me for my phone number and promised to call me.
I didn’t care too much because I was sure it was a standard night for him, a cute waiter, so I wasn’t really waiting for his call. He texted me the very next day that he keeps thinking of me but is afraid to hurt me and doesn’t know what to do. We met and spoke and we ended up making out again. And he said he wanted to be with me.
I gave him a week to decide what he really wanted and I left abroad. He kept texting me all the time when I was gone and when I got back, we met, he took me for a walk, to dinner and then I ended up at his place, of course. That had never happened to me before, I always dated men for at least a couple of weeks before I slept with them.
Right now we seem to be having a normal relationship although we don’t really go out and see each other very often. We often spend our time in bed and I’m okay with that because we both are rather busy people and we are tired to go out. Or maybe that’s what I want to believe. I don’t mind it too much but during the time we’ve been together I have really fallen for him and it bothers me that he prefers to keep our relationship a secret because, as he claims, he doesn’t want to explain anything to people that come to the bar and talk to him. He says they are not his friends, just customers and he is bothered to tell them anything about his private life.
He also was (and perhaps still is) kind of a womanizer but when we are together, everything is great, I really like him and I really think he likes me. I don’t think he is cheating on me but you never know. Lately I’ve been thinking about the secret thing he insists on and I feel kind of humiliated that he doesn’t want to tell anyone, not even his real friends.
Do you think I’m only a booty call girl to him? He said he loved me a couple of times but these are just words, right? I tend to freak out because due to this I don’t think I’m able to trust him properly. I really need to see this from a different point of view, can you please post me some advice? Thank you.
BTW. As for the age, we both are in our late 20s.