Rob plays Richard in the film here is the synopsis of his character:
Richard is just eighteen. He is a good looking boy, with an ambivalent feminine side, skinny and androgynous in the fashion of that time. He is narcissistic and entirely self regarding, his is a solipsistic universe with only one golden person inhabiting it; himself. Jane was the trophy girlfriend until he found better, then he was in turn dumped and now is back trying to ingratiate himself with Jane. He has written letters to the chateau, decorated the envelopes with psychedelic love hearts.
He sees himself as a lover, as a pop figure, something of a curious cross between Bob Dylan and Mick Jagger. He is the kind of boy who will hang around looking pitiful and hoping his moodiness will attract girls, which it does. If thwarted he will turn nasty in an instant, and does. He wants Jane to feel sorry for him for making the mistake of giving her up. He is desperate for her, but he is the wrong boy, he is an 'unsuitable boy'.
You can check out the official movie site for The Summer House HERE.