Vocabulary
Idioms
100
Scientist that studies people's mind and behaviour
Psychologist
100
Someone who remains a friend only when things are going well but abandons others during times of trouble or difficulty.
fair-weather friend
200
Self-disclosure
To share information about yourself
200
Someone who remains a friend only when things are going  well but abandons others during times of trouble or difficulty.
Defriend
300
When you know a person but you are not friends
Acquaintanceship
400
Mutual relationship
Reciprocity
400
If you borrow something from a friend, pay it back as soon as possible so that the two of you remain friendly.
Short reckonings make long friends.  
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