What are reasons why a fit, hot guy who likes slim girls would flirt with a chubby girl?

Anonymous
Guy said I look great and lost weight. He flirts with me a lot. Then I heard he also flirted with another girl who is chubby with an average face. I'm a lot skinnier than her. I also heard he hooked up with one of my friends who skinny with toned muscles. Why would he flirt with a chubby girl if he thinks highly of a slim figure?
What are reasons why a fit, hot guy who likes slim girls would flirt with a chubby girl?
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