Co-worker offers me rides home all the time...

My coworker wants to give me rides home all the time ( l live bout a mile and a half away from work, pretty close.) He lives about 20 mins. away. He's offering me rides home all the time and seems to enjoy getting to talk to me alone, flirts, etc. Yet he hasn't made a move or anything...what gives? Is he not interested but just being friendly? Should I make a move? I just can't read this guy!
Co-worker offers me rides home all the time...
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