Is he flirting with me even though he has a girlfriend?

This guy always says hi to me every time when he sees me and initiates conversations, smiles when he talks to me, jokes around with me, gets close to me when he talks, followed me on all social media and likes my posts/pics. But he has a girlfriend and it’s so confusing. I can’t tell if he’s just being friendly or flirting because it feels like flirting but I could just be delusional. The conversations are always casual but he always makes a point to come over and talk to me when he sees me and always says my name in conversation.
Is he flirting with me even though he has a girlfriend?
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