Artuhr is in pag-ibig with Guinevere. But they can't be together because the relationship between a prince and a servant wouldn't be allowed sa pamamagitan ng the king. their pag-ibig has no chance, Gwen knows that she can't be with him until he becomes king.
The scene in this week's episode reminded me of this. It's not the whole program, only the important parts (and sa pamamagitan ng "important" I mean "the parts Bradley's in")