Help! I asked him out and he's not interested is he?

he came up to me in person to talk, and was flirty and was looking into my eyes, but I got nervous and had to go somewhere...so I texted him and asked him to lunch sometime, and he says he's really stressed out from school and will try to fit me in sometime...

he never called back, but stares at me in person when we have class...he'll turn his body towards me and just look at me all day long...he even comes up to say hi...but he's not forming a friendship, or calling me to talk, and definitely didn't want the lunch date...
Help! I asked him out and he's not interested is he?
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