What does it mean if a guy mentions his ex?

teamderek13
Ok so I've been talking to my guy friend for a month now. He walks me to class everyday, texts or calls every couple days, and we're really close and flirty (im pretty sure he'll be asking me out in the near future). OK so yesterday, he asked me to go to his cross country meet so I did, but while we're hanging out there, his ex-gf shows up (she and I used to be close friends but she transfered schools) and he kept talking about her...like (sarcastically) "oh look it's my favorite ex-gf" or "ha she saw me walking over there and just left"...and part of me thinks he was just trying to brush it off and diffuse any tension there might have been but I don't know. When he mentions her, it makes me feel like he's comparing or would rather be with her...guys why would you mention your ex to a girl you're talking to? what does it mean?

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What does it mean if a guy mentions his ex?
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