How do I ask a guy if he is seeing someone else?

Anonymous
I've been on 2 dates with a guy who seems very laid back and quiet. We unexpectedly had sex on the first date and he told me not to worry because he wasn't the type to judge and he felt that I wasn't the type who would do that sort of thing. (One worrying thing though is he wanted to have sex without a condom but I refused). We spoke on the phone 3 times that week and he told me that he liked me because I was different from other girls because I wasn't clingy but at the same time, I gave him enough attention and that I was balanced. That comment made me wary. We went on our second date later that week. He took me out for dinner but he didn't invite me back to his place and merely gave me a kiss goodnight and told me that he'd like to see me again and that he would be in touch. That was a week and half ago. He is studying for an important exam which is in a week's time. I'm not trying to crowd him or demand his attention so I've restricted texting to twice a week which he responds to immediately. I feel that he is into me but perhaps the timing is wrong for us. However, after the last text conversation we had, I'm starting to wonder. In the last text conversation, I basically flirted with him and told him that I'd like to see him and he responded saying that he was swamped with work. My friends told me that guys don't say no to sex unless they are getting it from somewhere. Do you think this could be the case? Or am I being paranoid? Should I phone him during his study time or should I just wait till he finishes his exam and wait for him to contact me? Am I being paranoid? This is just not like me to be unsure about where I stand with a guy. Advice wanted please.
Updates
+1 y
The guy confuses me! Is he is interested or not? He texts hi today. I respond "hi stranger. miss our chats. didn't want to ring in case I disturb you but best wishes for ur exam" he responds "thnx. free from saturday till I go away for xmas. Catch up soon
Updates
+1 y
So after all your great advice, I told him I wasn't interested anymore. I didn't hear from him... He's back in my life. He rang me wishing me a happy new year. He wants to see me to "catch up" and says there are things he needs to tell me. I'll update you
How do I ask a guy if he is seeing someone else?
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