What does it mean when a guy keeps staring at me when he already has a girlfriend?

Anonymous
This guy keeps looking at me and saying hi to me every chance he gets and also once when he was driving in his car he saw me so he pressed his car horn just to say hi and he always be smiling every time he sees me whyy? So I asked him if he wants to hangout sometimes but he said he can't Because he have girlfriend and than he was like" if I didn't have a girlfriend I would go with you" but after tht he still be looking At me smiling and I just can't stop thinking about him he drives me nuts ughh I don't knw what to do he really is confusing but so adorable what should I do?
What does it mean when a guy keeps staring at me when he already has a girlfriend?
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