Guys, why would a guy heavily pursue me in person (we work together) but seems to play mind games when we’re apart?

Things like asking me to come over later but not texting me, or at first saying that he’s been overthinking things and wants to keep things cordial but then continues to pursue me afterwards?

Guys, why would a guy heavily pursue me in person (we work together) but seems to play mind games when we’re apart?
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