It's the gender-reversed version of the scenario where a neckbeard assumes a hot chick who is too nice to tell him off bluntly has romantic feelings for him, and then complains about being friendzoned when she doesn't want to have sex.  She was never really in a relationship with him in the first place.  That was all his own delusional wishful thinking. Same pattern here.  We can be quite certain the "skinny guy" never considered her his girlfriend at any point.