Confusion...Does he like me?

This guy comes into my work place occasionally for his store which sells video games. Last week I went into his store because i love to play video games. It wasn't too busy, and I stayed for about an hour. Every time he had to help a customer, he would come back over to talk to me. I went by his store a couple more times during the week and he always smiled and talked with me. One time he had saved a strategy guide for me for a game i bought, when they were going to throw all of them away. Obviously he had been thinking about me. On Friday, i said that we should hang out and he agreed and we exchanged numbers. I called him on sunday to see if he wanted to go have coffee when he got off work. He never called me back. Today, one of my coworkers said she saw him at a restaurant on friday night with a girl. She said that when they called their table, the guy was talking to my coworker and the girl just went off to the table without him. She said that they didn't seem lovey dovey. Should I continue to show an interest in him, or do you think this means he's seeing someone else? Please help.

just dont get played thats all. youre aware that he hangs out with other chicks so dont try to hide that you know. i mean you shouldnt go accuse him cuz you arent together. but i think being honest is the best bet. you could talk to him and say.. "hey my friend saw you at that resturant... do you go out often? is it a cool spot? maybe we could hang there"... or just sorta lead the converstaion to find out if he would be interested in getting to know you and all that good stuff.
im always honest like that but maybe thats why i am single.. lol.