This always drives me crazy!!! Eve even shows him the letter in which he explains that he can't escape to be with her, but would prefer to die, as that way perhaps he can find Vicki. He loves her that much.
So, he's found his Vicki, he still loves her as Jeff Clark, but if he might be Peter Bradford then he can't marry her. As crazy as the whole Jeff-Peter business was from the start, this turn is totally idiotic.