I suppose you could take the fact that he said that she reminds him so much of his wife as a clue? Does anybody know if he was talking about his current wife or first wife?
Also, she was the one who said that he shouldn't be flirting with Keeley, reminding him that he had a wife [possibly her mum] at home!!
Note:
[Don't really believe it's true, but I like having some fun with these theories] .
