So if Yoyo boy has a split personality one of which lives in an alternate reality 24/7 mebbe that's what gives the appearance he is a LIAR?

The two faces of yoyo boy is what's apt to be the problem. One face sez does thinks one set of stuff and the other sez does thinks another set of stuff and the sets of stuff are often exactly the opposite. Two people brainwise mindwise otherwise elsewise.