Context: THAT moment , the one that s caused me so much stress and anxiety and happiness . I ' m always telling myself that I ' m over it or that I ' ve moved on and then moments later I find myself rethinking about it again , about this person , about how we could have been happy . Nope . I bought this book at Borders today , Evolution 's Rainbow .

Question: What may be the reason they are having such a hard time letting go ?
Options:
0. They thought they would be happy with them always .
1. None of the above choices .
2. They are looking for external sources for internal happiness .
3. They thought that they would make them happy but they did n't .
Answer: 0