I believe he said that his partner knew all about it, except that he was coming back for Una in the seaside town, but didn't find her. He left the police, and everybody else, under the impression that he had second thoughts and abondoned Una at the B&B.
On the other note, can you really speak of rape if it was consensual? Because following the account Ray gave (and that Una didn't protest against in any way) nothing happened against her will. Is it just a matter of saying that a 12-year old doesn't have a will of her own, that she didn't know what she was getting into? I.e. is it automatically "rape" if the girl is this young, no matter the circumstances?
I left the play under the impression that, as much as Ray did a terrible thing, Una was sexualized even before she met him, and would have probably needed psychological help before, not to speak of after (which I think she did receive, albeit to not much avail)... Following Ray's account that Una didn't rectify, Uno initiated the "romance". If she had been older, you'd say she seduced him. Obviously that doesn't change the fact that Ray shouldn't have been attracted to her, let alone "give in" to it. After all, he was the adult here. But I just not sure he actually sought her out initially, I was inclined to believe him there... Just my thoughts