what makes someone a second choice?

This guy I have a crush on (also he is my friend) liked this other girl, but he quickly stopped liking her but still kept talking to her since he felt bad. He would sent me such rude things about her. He had no feelings for her at all for the last couple of days they were talking. He ended up falling for me weeks and weeks later, and she's going around telling everyone that I'm just his second choice because he couldn't get her. Am I really a second choice?