Joel and Clementine
After one argument too many, both Clementine and Joel find themselves having their memories of eachother erased.
Joel however still cannot get Clementine out of his head, suffering fragments of memories he wanted to forget.
They both struggle to remember eachother, finally succeeding but feeling like strangers. But despite the unfamiliarity they agree to give their relationship another try.
Although the ending is inconclusive, you are left knowing that they will work it out, simply because they couldn't forget eachother.