Why would he give me his number if.....??

I met this guy at work I'm really interested in he would ask if I had a boyfriend and why I didn't have one so I assumed he was interested especially when yesterday he stopped me before I left to go home and said "can you keep a secret?" I was confused by his question but I said yes and he said "well here why don't you take down my number" I pulled out my phone and did just that...later on that night I texted him it was around 10:30 because I didn't want to text him TOO late into the night but I didn't want to text him early right after I got his number and seem desperate...but he never texted me back...at all...so the next day at work I playfully smiled and said "so you can't text anybody back" (I smiled because I didn't wanna look desperate) he looked at me and smiled and said "ohhh I didn't get get home til around 1am" (im guessing from work) but something in his body language told me different...he would look at me and look down quickly at something else and continue moving around a lot...i know he was working but a little more eye contact would have been nice...then he said "ur gonna have to text me again because I didn't get home til late" then I said "so you didn't get it?" he took a quick pause and said no...so by now I'm like wtf...so I gave him my number instead and told him well this time its ur turn to text me first he said "alright I got u" so I left...when I got outside I deleted his number out my phone to resist the temptation of texting him first and if he text me then I would have his number again...its almost 11pm...no text...i don't get it...y would he want me to have his number if he doesn't plan on talking to me? This is wasting time 4 no reason...I'm really interested in him but not enough to be desperate I was happy when he asked me to take down his number but its not going the way I planned...y would he give me his number when I didn't ask 4 it even though I'm happy I got it...should I just 4get about him and move on?
Why would he give me his number if.....??
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