Hi. Yes I thought the same, the most honest way to sort it all out would be to say there's another side to me you don't know about and I know you won't like it. But Mason would pursue what that is. And if it were me I'd be pretty irritated at being told what I think by someone else, so yes that conversation route is pretty messy. He can't tell her more than Lois!
Actually I think it is a bit of a assumption on Clatk's that Mason couldn't accept superman if she really understood who he is. We see as she is dying at the end of the episode that she entrusts him with her clue, after discovering his secret.
Coming across as quite the Mason fan, which I'm not really, but every time I watch the middle of session 2 it annoys me how Clark strings her along and doesn't put her out of her misery. He clearly never wants to go on any of the dates she invites him on.
