Why would a guy who has a new girlfriend keep making intense eye contact and flirt with me?

A guy I know seemed to like me a while ago, but due to circumstances he’s moved on and got a new girlfriend. However I notice he still checks me out, engages in intense eye contact and seems like he’s happy to be with me when talking, he leans in close. What’s going on?

Why would a guy who has a new girlfriend keep making intense eye contact and flirt with me?
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