Why do you care so much? The boy is just a servant. What if Arthur was the one to kiss Merlin instead of Gwen in 1x04 The Poisoned Chalice? After returning from the journey to retrieve the Mortaeus flower, then watching Merlin almost die and kissing him, Arthur is arrested for disobeying his father's orders to stay in Camelot. At least he has some time alone to think about why exactly he kissed Merlin. Merlin, on the other hand, can think about the same thing from the comfort of his home. When Arthur is released from prison, they both need to talk.