Can anyone please help me understand this?

Soo one night...my friends and i went to a hooka bar and i met this guy there...we talked, danced. It seemed like he really liked me. When i was leaving he asked me for my number. That same night he text messeged me sayin wats sup...we started talking that night on aim and the convo lasted for an hour. He told me how he was really attracted to me..and how he would love to get to know me better. he's greek and im russian. he seemed like he was pretty cool with that....the next day he texted me again sayin hey and that he just finished work. i replied back and said...cool where do u work? and he never responded back after that...that same night i was online and asked him wat happened and told me he was "busy wit school" cuz he also goes to college...after that he hasnt been textin me or callin..that is soo weird can anyone explain to me wat happen ...and why all of a sudden he changed?