Was he flirting with me?

okay well i went to Hot Topic like yesterday and the guy(on his name tag it said Calvin)thats a hawt name jk haha,anyways he greeted me with a"hello may i help you find something"he said it with a grin on his face.i told him"no thanks but thanks for asking"then i started browsing shirts,then i saw a real cute pink shirt(sorry im a shopaholic)then i felt a hand on my hip and i saw Calvin,he said"you can have it for free,if you want to"but i paid him anyways and when i left the store,he asked me for my number but i refused(hes a stranger!duhh)then i left but then he yelled"hey!!girl"then he waved to me and i waved back giggling(he was kind of cute)then he went back inside and almost tripped over a Fred shirts mannequin(LOL!!major LOL!!)do you think he was flirting with me?i saw him again today but he ignored me and didnt even offer to help.