This will be very difficult for Clark to get out of.
That fact that he allowed her to 'unburden' herself to him, and she allowed him to see her emotional collapse, will make it very hard for him to ever tell her the truth. She will have to hate him for what he's done.
The only out he can use is his insistance that Clark *is* dead and therefore there was no reason to tell her 'the truth'. Though she won't see it that way.
Nope. No way for a happy ending here.
Tank (who thinks that's a refreshingly different take on TOGoM... no happy ending)