Coworker called me her valentine, was this flirting?

I was leaving work on Friday and I passed by my coworker. She was talking with another co worker of ours and when she saw me as I was leaving she was like Hi _! Happy Valentines day my valentine! Then I think she asked me something else but I was already out the door at that point. Her and the other girl asked me if I was doing anything I think.

I just wonder if this was flirting? I did not expect that.

I am a guy by the way.

Coworker called me her valentine, was this flirting?
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