Why would a guy ask you if you have a boyfriend if he is not interested in you?

[Anonymous]

He asked the first time but I dodged the question because I don't like telling guys that I'm single because of bad experiences with guys. The second time he asked we were already closer than before so I told him. He also likes making jokes about marrying me.

[Guy13]

You are free combined with Vision of marriage/Wifey quality = Tagging...

[In_Trance]

Because if you say no, there's a better chance of him railing you

[spartan55]

How do you know he isn't interested?