I hate it when someone who I trusted wholly turns into a monster . Thursday night I had a really awful experience that I wo n't go into detail to protect this person , though I really do n't know why I would protect , but not only was I used and just objectified , but completely and utterly shocked by this person 's complete lack of loyalty . But enough about that .

Question: What may be the reason for their friend 's betrayal ?
Answer: Their friend was just there to use them .Their friend wanted to impress others .Their friend wanted them to feel bad .Their friend wanted to upset them .