Flirt or friendly?

I have this coworker. We like each other and we know it, but she's living with a man she's having trouble with. We flirted a little in the past but nothing excessive. The other night we were alone at work. I had brought some chocolates, and in the end, the last one was left. I told her to take it many times, but she said, "Why don't we split it?," so she took a bite of the chocolate and gave me the other half... is it flirting, as I think, or is it something you girls would do with a friend? I know it may seem like a stupid question, but I'd like to get more opinions.

Flirt or friendly?
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