> Chris bought that watch for $200, however he is not using it, he is
> such a ***fickle*** person.

ODO:

> **[fickle][1]**
> 
> *ADJECTIVE*
> 
> Changing frequently, especially as regards one's loyalties, interests,
> or affection.

> ‘Unlike Fred who is a creature of habit, I am far more fickle, always
> in need of new experiences, change and variety.’

Collins:

> **[fickle][2]** 
> 
> *adjective*
> 
> If you describe someone as fickle, you disapprove of them because
> they keep changing their mind about what they like or want.


  [1]: https://en.oxforddictionaries.com/definition/us/fickle
  [2]: https://www.collinsdictionary.com/dictionary/english/fickle