I work at a grocery store. One of my co-workers has become a really good friend of mine. We tease each other and we talk to each other. The other day I went through his line to buy a drink. I reached for the receipt before he could hand it to me. He tease me about saying he wanted to give it to me. Later when I was checking someone out he reached over and place the receipt on my counter. Could this been seen as flirting? He was also happy that I was the one working with him that night (he vocalized it). Other times he won't speak to me when they're are other people around but will when it's just us. Someone told me that could be a sign he likes me.