What does it mean when a guy and girl are dating, but he doesn't change...

...his relationship status on facebook? The girl claims that they were boyfriend/girlfriend, but he had never changed his status on Facebook. Is it possible that she is lying that they were even girlfriend/boyfriend and that they were just dating? (she claims he went to a dance with me as friends when they were dating, which doesn't sound believable to me. My school was holding the dance and both the guy and this other girl go to different schools, so she claims that he went to the dance with me when she was dating him. Would a girl be ok with her boyfriend going to a formal dance with a girl if she wasn't going to be there?)

He left it as single, never changed it to relationship.
 
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