Why won't he have sex with me?

So this guy and I have been talking for a bit. We basically agreed that we would only hookup as I have dated his brother before which he thinks will ruin things if we do anything more. I just want to hook up as well. He basically talks dirty with me and says he wants to have sex , he says he wants me really bad , he says im hot and everything but then he doesn't do it. He just makes an excuse but then says I want you so bad dont think otherwise. Im pretty sure he's a virgin because he didn't tell me he's ever had sex before and he's always very nervous around me. He asks me what I like in bed and he told me to wait a bit. Im just curious as to what he is doing right now while im “waiting”…… is he somehow preparing? or like nervous? Whats going on?
Why won't he have sex with me?
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