i had no problem with it. i mean, you knew that there was no way the ending was going to be "happy". i actually thought it was going to end with her drowning herself. but i think the ending was in keeping with the rest of the film in that she is detached, has trouble telling what's real & what's not, and is going to live with that kind of paranoia for a long time, perhaps forever.
------ "I can't promise I'll try. But I'll try to try."