Read the full text of Cymbeline Act 4 Scene 1 with a side-by-side translation HERE.
Cloten enters, alone, dressed in Posthumus's clothes, near Belarius's cave. He congratulates himself on his brilliant plan. There's a lot of "Wow, I'm amazing" happening here.
Cloten's pretty sure that no matter what he does to Imogen, he won't get in trouble. His mom controls the king, after all.
Cloten comes upon the meeting place and hopes Pisanio hasn't lied to him.